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  #1  
Old 08-12-2018, 11:34 PM
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Custom W126 Solid Teflon Window Regulator Slides

Anyone with a W126 (especially the long wheelbase models) is familiar with the plastic window slides breaking and leaving the windows partially or non-operational, usually when it's raining outside...

The usual solution is to use the OEM slides, which are a flawed design (flimsy), or the MB-Source "solid" ones which are actually a cast resin and don't hold up much better.

My design is more basic and uses solid heavy-duty UHMW plastic, also known as Teflon. It's self-lubricating, extremely durable, and the design of my slide makes it easy to replace in the future (not that you'll have to) and is durable enough that it will tolerate misalignment of the window regulator crank or a less-than-lubricated window guide channel. Beware of sticky windows, if you install this part it won't break if the window jams, your regulator crank will bend instead.

I've run the prototypes of these production slides in the rear windows of my SDL for well over a year with heavy use for the dogs, and installed a set of the production slides in the front earlier this year. I have a few distributed to friends with W126's who also have had success repairing their windows with these.

Each kit consists of the UHMW slide, 2 washers, plastic spacer, brass bolt, locknut, and an instruction sheet.

W126 sedans have one slide in each door, for a total of 4 pieces per car. The rear windows tend to be the most prone to breakage due to the high stress design of the regulator arm. Long-wheelbase cars are worse about it than short-wheelbase cars due to the heavier window.

Cost is $17.50 per kit, or $25.00 for a pair shipped USPS Priority anywhere in the Continental 48.

I've made a small production run, when they're gone they're gone. If there's enough interest, I'll make another production run.

Please PM me if you're interested. I accept payment via PayPal only and will not "hold" an order, I've been burned in the past with that!
Attached Thumbnails
Custom W126 Solid Teflon Window Regulator Slides-126slide.jpg   Custom W126 Solid Teflon Window Regulator Slides-126slide2.jpg  
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  #2  
Old 08-13-2018, 06:20 PM
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Quote:
Originally Posted by Diseasel300 View Post

My design is more basic and uses solid heavy-duty UHMW plastic, also known as Teflon.

D3:

It seems correct to point out that you have claimed use of what are actually two different plastics.

Teflon, a registered trade name, is polytetrafluoroethylene [C2F4].
Ultra High Molecular Weight polyethylene (UHMW) is just that: polyethylene [C2H4].
They are very definitely not the same.
UHMW is sometimes disparagingly referred to as "Poor man's Teflon".

Last edited by Frank Reiner; 08-13-2018 at 06:45 PM.
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  #3  
Old 08-13-2018, 07:38 PM
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The label on the plastic was very clearly marked as Teflon-impregnated UHMW plastic. The stuff used for the slides is leftover from a military project and is unbelievably tough stuff, just machining it is a major undertaking. It is not like plain UHMW, which I'm very familiar with.

When you come up with something better, let me know.
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  #4  
Old 08-14-2018, 01:52 AM
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I have a set installed between two cars, work well for me! I have installed those dumbass cheap ones too many times over the years!

Need to order another set actually, 300SEL had another break recently.
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  #5  
Old 08-17-2018, 02:38 AM
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How would these apply to C-126’s?
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Old 08-17-2018, 11:31 AM
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these work on w123 electric windows?
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  #7  
Old 08-17-2018, 12:47 PM
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Quote:
Originally Posted by gear-head View Post
How would these apply to C-126’s?
I believe the C-126 uses the same slide in the window mechanism, but don't quote me on that. Pelican Parts DOES show the same slide listed as for the sedan models.
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Old 08-17-2018, 12:48 PM
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Originally Posted by garyd75 View Post
these work on w123 electric windows?
The W123's are a different mechanism - as far as I'm aware, they do not use this type of slide.
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  #9  
Old 09-20-2018, 10:20 PM
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Sent you a PM, hopefully you still have a pair available.
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  #10  
Old Yesterday, 08:13 AM
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The flimsy sliders are actually a planned safety feature. They serve two purposes. They provide a bit of "cushion"when the window reaches its full "closed" position and they lessen the chance of severing body parts, fingers, etc.

Please be aware of this when you replace them with "solid" sliders. Since Mercedes do not have "stops" on their regulators you can tweak the regulators when the window reaches the closed position and the switch is not released.
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Old Yesterday, 09:51 AM
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It's your car, you do what you want. The clamshell plastic/rubber slide is a stupid design and inherently weak. I'm sure the intentions were good, but when you use the same regulator and lift mechanism from a standard wheelbase car on a long wheelbase car and expect it to cope with the extra weight and drag from a larger, heavier window, it isn't going to end well.

My car has the windows adjusted about as perfectly as can be expected, can be lifted with a finger, don't bind in the tracks, regulators are smooth and aligned properly, and they still went through a set of OE slides after a couple hundred operations.

These "alternative" slides are there for people who don't want to deal with that kind of BS. If you don't like them, don't buy them. It's really that simple. I don't really care either way, but I'm sure someone who wants their windows working and is sick of the OE slides does.
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  #12  
Old Yesterday, 10:22 AM
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Oh I agree with you regarding the slides. Those flimsy slides have caused me no end of head aches. Your slides are a vast improvement and I heartily recommend them.

I just wanted to warn people about what could happen and does when someone who does not understand to release the switch when the window is already closed.
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  #13  
Old Yesterday, 01:52 PM
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The lack of any sort of limit switch has long confused me about the window mechanism. Even some sort of clutch on the motor drive would have worked (a disc and a cup with a spring would have been more than ample!). I suspect the lack of any sort of limit is the cause of so many bent and worn out regulator assemblies. Lube, proper adjustment, and not laying on the switch button all contribute to a long and trouble free service life. Oh...and getting rid of those crappy slides!
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Old Yesterday, 02:39 PM
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Diseasel300 - still have not installed the set you sent me. Too doggone hot in Atlanta now. Will let you know how they perform.
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