pots aren`t sitting right

[strawbfan]

Hi I bought the RC4 bass kit,got it all stained lacquered and buff out,neck glued on.I was attaching the pots to the pickguard ,just to see how they would sit,they aren`t sitting flush.There is a little metal nub sticking up on the pot,does it need to be filed off?Or is there a trick to get it to sit flush?I will attach a picture