Hey there Dragonwalker!

I never heard of a Kryptonite Lock that rattled, before!

OTOH- If a thief really wants your bike, Walmart versus LBS, won't really matter that much!

If it's a Kyrtonite, just buy it! Especially, if their locking mechanism looks the same...

- Slim

PS.

I would want to open/reopen a few times before the final purchase...Or maybe just do it in the store before you exit!