that sounds wrong. there should be some sort of nylock nut, or a allen head bolt or something. then again, the design has changed a couple of times.

anyway, CB won't ask you for a receipt.
i got my beaters back in february and emailed them in the summer about the play in my pedals. The email exchange went something like this:
"i have play in my 6 month old pedals, what do i do?"
"what's your address, well send you some bearings"
"woot"