If he drilled and tapped deep enough, and there are enough threads I would use some red loc-tite on a small allen set screw, put that in at the bottom of the hole as a plug, leaving enough room for the regular screw on top of it. Should never have to worry about it again.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-