A nailer driving two nails at a time is usually because the tip of the driver is bent causing it to catch two nails each time it comes down. On rare occasions you can remove the piston/driver and straighten it out but usually not. The driver is hardened steel and has to be perfectly straight to work properly. The part you need is Hitachi's piston, part number 884-330. Shop around the net for one as they are expensive, usually $70 to $80 plus shipping.
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