My FN250C nailer with porter cable no longer works. When I pulled the trigger, I heard air coming out. I googled the problem and people pointed to this part as the culprit. Ordered a part and replaced the broken part and the finish nailer started working like new. The steps I used to replace the trigger assembly are: 1) There are three pins behind the trigger. Two hold nothing but print and one has a small black elastic. Using a set of nails the size of the studs, carefully/slowly drive in the studs with the set of nails (be sure to remember/note which studs go in which holes as they are different sizes). You do NOT want to damage the pins/rubber as you will need them to reinstall the new trigger valve assembly. 2) Pull out the trigger (red on my nailer) and note how it connects to the trigger valve assembly so you can reset it the same way. 3) Pull out the old trigger valve assembly with your fingers or pliers. 4) Lubricate the o-rings of the new trigger valve assembly with air tool oil (available online or at local stores). 5) Install a new starter valve assembly. 6) Reinstall the trigger and line up the holes in the trigger with the holes where the pins were. 7) Use a hammer and a set of nails to gently hammer in the pins. The pins are in the right places as they are different sizes. 8) Attach the black rubber band to the pin it came from. I hope this helps, it saved me from having to spend over $100 on a new nailer. Perform this procedure at your own risk. You can find some videos on YouTube that can show the process.
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