The threads on my pump were quite sharp and very tight when threading on a cam lock. When threading on an SS female NTP threaded fitting, it threaded on fine. The threaded fitting was lose on all threads I tried, but the cam locks have a very precice thread with very little variation room.
I used some teflon plumbers tape on the pump threads, and threaded on the cam locks. They only thread in about a third of the way, but they haven't leaked yet. Remember too, it's not like our brew setups produce 30PSI of pressure or anything, so I wouldn't worry too much about leaking, just juse some teflon tape.
I'm still very very happy with my pump.
BUT, for the record, I was pissed too when I first went to thread on the first cam lock and it didn't thread on very far.