I put a mic on the new nipples and they are exactly the same size as the old ones. when I first started this I pulled the spool valve out and cleaned a bur off of it. I thought I put it back the same way it came out and looked at some pictures I found on the internet of one that had been disassembled. if I did make a mistake and put it in backwards, could that cause a problem like this?

 

It might, IDK, but the one that's not leaking take it apart with one that is and ck it out