Our Bostitch RN46 coil nailer was bought new last July and has only put on around five squares of shingles. We used it today for the first time since last summer and at first it was mis-firing, only shooting a nail every other time the trigger was depressed. We sprayed WD-40 on the head and nail feed area. After a while it started to work normally. Then a new problem developed, the driver would not retract and had to be pushed in by hand. What is supposed to retract it, a spring or air pressure? What can we do to fix it? Thank you, Paul

Going strickly by what you said above, it sounds like you put it away 'dry'. If you are not going to use a nail gun for an extended period of time you should lube it well with pneumatic gun oil and fire a couple nails to distribute it throughout the gun. When you take it out of storage, put a little more pneumatic gun oil in it and fire some nails to get it well lubed again and blow out any excess oil. WD-40 is OK on the exterior of the gun as long as you blow off any excess after spraying it on; never use it inside the gun. The problems you are experiencing now are indicative of broken or damaged o-rings inside the head. Some of the o-rings act as seals and some act as valves. There is also a rubber bumper at the bottom of the cylinder. When the driver hits the bumper it is pushed back up by the rebound off the bumper and assisted by air pressure. If one or more of the o-rings are damaged the air isn't directed to the proper place to make these things happen. Bostitch makes a rebuild kit for your gun. It's part number RN-46RK. You can find them on several on-line after market sites and should cost around $30 to $35. Use all of the parts in the kit and you'll have a gun as good as new.