Anyone interested in doing their own valve adjustments could take some time and look into the details of that and the wrenches and alternative methods.
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There is people that change the Glow Plugs on the 617 type Engines without removing the Fuel Injection Hard Lines. If I did that I am sure I would need at little bag of those little nuts because I am sure I would loose them. But that is a personal issue. I had arthritis and that carpal tunnel issue way before 2007 and it has not gotten better since that tome. Manipulating stuff in tight places is tough for me.
People new to Diesels often don't know or get the idea of how to bleed the air out of the Fuel Injection Hard Lines without killing their Battery. But, if they have the Valve Adjusting Wrenches they seem to be able to adjust the Valves.
For the reason to buy the set of Hazet Valve Wrenches as soon as I got a good price on eBay was that the easier the job is to do the less likely I will put the job off to another time. Also the Hazet Valve Adjusting Wrenches hold their value. Also the first time I adjusted the Valve I had to use the Third Wrench on some of them.
Two sellers on eBay are selling homemade sets that are bent but still have the box ends on them. No welded extensions on them. They are asking $45 for them but I did not notice if that was with free shipping. So if you made a set for yourself it would have some cash value if you ever sold them.