Originally posted by Ron Boggs 
...So one of the customer service guys went an extra couple miles to work with his techs to come up with a permanent solution. I hand-carried my 600/4 to them. They tightened it on site there in Colorado and used some sort of Loc-tite type product (I think) and the lens is still tight to this day--decades later (lens is now owned by a forum member in Australia). ...
If you use Loc-Tite, get the blue formulation, not purple, and above all, not red - otherwise you'd have to use a torch to get it off again if it ever needed repair in the future. The products are color-coded by break-free strength - on really tiny screws, even the blue might be too much - a screwdriver would destroy the head before the screw would come loose, I'm thinking. As a hint as to how strong "red" is, that's what I use to secure the bolts that hold the ring gear onto the differential case in my 1990 GMC Suburban.
Post #15 by gjm
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