I just got a Senco - model SFN2 air nailer.
I found it at an auction and it sold real cheap because there was a
sign on it that said "Needs Work". All I had to do was put a little
WD40 in the air fitting and it works fine.

The only thing, it is constantly leaking a small amount of air from th
exhaust port on the "head".
What could be causing this air leak?

Mark