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The shaft or pin that drives the nail does not retract on my mastercraft 3 1/2 framing nailer. #58-8434-4

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Take the back cap off of the nailer. There is another loose cap in that head, most times that gets stuck. Believe me, I was raised by a carpenter that had nail guns before anybody else did. Also, sometimes that plunger gets bent, just straighten it out. Check for blown o rings. If it is old, take the trigger assembly out and clean it out. Be sure to oil everything well before you put together. We use marvel mystery oil, or nail gun oil.

Posted on Jul 11, 2010

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I took mine apart cleaned everything oiled it all up and put it back together. I got about 3 nails in before it did it again. I took out the firing pin and checked it for straight and saw no sign of a bend. I put it back together and it still sucked. I threw it off the roof and have not use dit since. What a POS. My recommended solution involves spending money on a product that is not sold at Canadian Tire.

Posted on Aug 14, 2010

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