The kit was basically your shotgun approach. Just replace all the parts that could wear out, and you basically have yourself a new nailer. I like this nailer and I'm glad it only took a few bucks to but the kit, and about 30 minute of messing around with the parts to get the nailer stripped down, clean, and back together. The instructions are minimal. It took a two tries to realize I needed to put some of the grease on the "O" rings to get a good seal out of them.