I couldn't remember if I put a star type nut on the fan clutch of my 2.6 190e or not. Question answered. This tool is so useful in so many ways.

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A tool so good it's top secret!

Can you elaborate a little bit? What are we looking at in the attached photo?

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Cell phone boroscope

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Camera. It has a flexible shaft and light on the end. An obvious use for it would be to watch for the torque converter drain plug while you are turning the crankshaft.

I actually got it so I could drill a small hole in my drywall and look at a pipe inside the wall. But the automotive applications are unlimited. Like it!

I got this one:

https://m.harborfreight.com/digital-inspection-camera-61839.html

I'm sure there are better ones. This one has survived.

A good picture. would tell a thousand tales Get one to to fit in to your usb socket on the computer they come on a 6 foot lead . Bore scope

I got this a few years ago. Does look like there are inexpensive ones now that plug into phones.

Thought of another use. Removing power seats from a junkyard where they don't allow jump boxes.