[DeTomaso] Simple method to determine if you have multi groove valve locks

[Ken Green]

Terry Parker in Australia shared a couple things with me which seem useful (I think one may be commonly known, but easily forgotten):
 
1)  The keepers on multi groove valve stems butt up against each other on both sides, but after market single groove locks will have a gap on at least one side.
 
2)  Many or most stainless steel valves are non-ferrous, so if a magnet doesn't stick, you know you have stainless steel valves.
 
Seems useful.
 
Ken