Should these nailer be able to drive 3 1/2" nail and coutersink the heads.
Mine would not successfully sink them every time so I rebuilt it, all new
seals, bumpers. It still will not sink them fully and if trigger fired it
occasionally double shoots. I have tried pressures up to 120 psi with 3/8"
hose and fittings. It works better if I put all my weight on it and trigger
fire it than if I hold down the trigger and bang the gun on the work.
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There is a small adjustment on the shaft that drives the nail. It
normally leaves the head of the nail not quite flush (sticking out about
1/2 the thickness of the head). If you make the adjustment - it will
drive the nail flush. You have to at 100 PSI keep your weight on the
nailer until the stroke is finished to get a consistant result. Most
people flinch a little when the trigger is pulled - since there is a
noice and a sharp movement. You have to practice not flinching. Remember
that when you are running higher air pressure to use your lubricant
regularly - I add a drop every coil when I am running 3 or 3 1/2" nails.
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