Hitachi 339087 Driver Blade Np18Dsal Part

I’m a cabinet installer and use the cordless 23 gauge pin nailer by hitachi to install trim on the cabinets. My pin nailer was shooting 3 times and then jammed up. Everything that I read and watched on video came to the driver blade. I found the parts number and went to Amazon to buy it. The driver blade was at a good price and exactly the same part I need. Now this is the tricky part SENT IT OFF TO HITACHI ( OR METABO THE NEW NAME) because there are no instructions or videos out there to show how to install it. I work on my other air gun nailers for the air compressor with no problem, but if you take one wrong screw or bolt out your screwed. The cordless nailer is a spring action nailer and if the spring comes loose from the gears system that recoils the spring your screw. So if you know how to install driver blade it’s for you, if not sent it back to to the manufacture and let them fix it.