Oren wrote:

Fancy. Just un-screw the ball.

Which gradually occurs by itself over time until, one day, the keys fly
all over the place when you pull the ring out of your pocket. Not fun in
a dark parking lot.

I'll repeat the advice that others have given the OP: get another copy
of your car key; put it on a small, plain ring by itself with a tag
listing the make, model, and color of your car; and use that whenever
you need to hand over your car for service, cleaning, or parking.