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Auto winder AW-1 service tips

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I've recented picked up a Nikkormat ELw and a Nikon EL2 both with the AW-1 auto winder. Both auto winders needed to motor gear replaced. You can find them on eBay sold by Sover Wong or you can buy direct from him. I started repairing the AW-1 with full disassembly, but after a couple of repairs I could the best way to tackle this is as follows...
Heat up the top leatherette cover with a heat gun or hair drier...get it hot and peel off the cover.
Remove the 2 screws holding a collar at the drive hole
Remove the metal plate...I think about 7 screws all exactly the same
With that cover off you can see the nylon gear. Check it with a magnifier for a thin crack.
Remove the gear with needle nose or forceps
Heat up the replacement gear (assuming it's brass) and with tweezers position it and tap it down. I used a screw driver with a small socket head and a hammer. Light taps and it will slide down into position with the motor shaft flush to the top of the gear
That's it...reassemble and test before gluing the leatherette back in place
If it still doesn't work then the gears might have seized up requiring a full disassembly and clean and lube.
I've had one gear replacement go smoothly as above, and a second drive had to be disassembled and cleaned and lubed.

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