ORIGINAL: Diesel Fan
ORIGINAL: Motorboy
Two alternative..
1. Make center hole in the compression screw to prevent the screw are rotating out.
2. Make a locknut with lever to hold the compression screw locked.
Or 3. You could copy the DDD setup with a tangental grub screw locking the comp screw.
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My easy solution is to find a nut that fits the comp screw, put a "star" washer on the screw and pinch the nut down onto the star washer enough to create the desired amount of "stiffness" to stop it drifting off by itself. Once set this can be left alone for years (as on 2 of my PAW Diesels)