if it's a new one take it back... if it's an old one replace it (they're only $25). either way, don't use it, it's too bloody dangerous the way it is!
worst case scenario...
I'd hate to be dead, or worse crippled, and only have a $25 piece of kit to blame... that and my own tight arse (the one that no longer has any feeling in it and dumps in my pants whenever it pleases)

... that's if no-one else is hurt in the "worser" case scenario