Okay here's what you can do. Use medium strength Loctite thread locker and the only way you will get them off is with a wrench, of which you might want to keep in your trunk somewhere.
Or what I have done is drill a small hole in the side of the valve stem cover use a #4 tap and insert a #4 allen head set screw.
of which again you MUST keep wrench in you car.
The LOCTITE can be bought at any hardware store. The latter however is much cooler and gives you bragging rights.
Hope this helps.
"J"
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