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  1. I haven't used this nailer much over the past 3 or so years of owning it. Maybe 3 rows of nails if ya lucky. As I was doing some window trim using 2" and the good old "popping" sound changed to more of a duller thud. From there on no matter what size nails I shoot, they sit proud about 10mm above the surface. So I though this could be a binding striker problem or piston binding in the cylinder. Even blown o-rings in the cylinder. Being out of warranty and being handy I watched a couple of YouTube vids (most were for tools not firing at all) and did some readying. Seems that the grease or lube tends to thicken inside the tool over time when not used. I lubed it up externally but with the same results. So I dismantled the pistons from the cylinder and did find the internal grease a bit thick. I cleaned it up and re-lube with some lighter weight oil. Re-assembled but have the same results. The striker piston and and the attached striker seem to fire all the way but that's hard to measure while just activating the tool with the nailing carry cage removed. The lower piston which has the gear bar that's driven by the electric motor however doesn't seem to slide smoothly in the cylinder whereas the upper piston with attached striker does move well. Putting it back together I didn't see if or where the ring gear on the electric motor and the relative piston height on the gear track should be aligned. Maybe that's not required as the piston is driven down and aligned (height wise to get the required stroke length) on first fire? Or should the piston be at its lowest or heights stroke length on re-assembly? So I'm left wondering is if A/ a sticking or out of alignment lower piston within the cylinder is causing the lack of driving power. Fix; order and replace lower piston and gear track. Or, B/ the top piston with the attached striker needs replacing (it moves freely in the cylinder and the o-rings on each piston seem in good condition). Had anyone seen this before, or know if the bottom piston should slide freely? I don't want to throw away the tool that near as heck brand new nor order parts that all look visibly in good condition. TIA
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