As I recall, you can get those screws with drilled heads for safety wire.

Jim



" jls"
shared these priceless pearls of wisdom:


-
-But as for those screws that back out, the news spread, two or three people
-got nervous about theirs and sure enough they found some loose and one of
-three screws backed completely out and gone.
-
-You may have plenty of space at the back of the mags where you or your
-mechanics can get a screwdriver in there and do some serious torquing. On
-an aircraft where the fit is close, it is more difficult to tighten the
-screw. I remember one where all the screws but one were gone and the third
-was loose: the only thing holding the harness to the mag was the tight
-space.



Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com