Do any of you have one...On mine the yellow plastic nose piece keeps popping off, and now it won't stay on. Any ideas? I really like this nailer...is it okay to use without that piece? It seems like it would slip around without it? I've seen a few nailers & staplers at Lowe's on the discount table (used returns would be my guess) that where also missing these pieces, so I am assuming this is a common problem. Looking for some feedback.