Well, I just installed a set of locking valve stem caps.

They are great looking and easy to use!

I found them on EBay for $8.95 INCLUDING SHIPPING!

Search for "spin-caps"

They are made by KLM Innovations.

They are made of billet aluminum (not chromed)

I haven't seen them on EBay since.

I did ask the seller if he intends to put any more on EBay.

I'll keep you posted