I am currently restoring a Copal model 707 and as you may or may not know, all the knobs and what not to adjust the clock, are on the bottom of the 707, also the gearwheel which you turn to set the time. There is a larger gear which protrudes out of the bottom to give your finger just a bit of leverage to turn it. This gear is connected to another gear which sits on a shaft and turns the shaft. In order for this 2nd gear to be able to turn the shaft, there are 2 cutouts made on the shaft and the same cutouts are made in the middle of the gear so it sits snug on that shaft and when the gear moves, the shaft has no choice but to move with it... So far so good, however... this 2nd gear has a couple of teeth missing, either it is plastic fatigue or someone with really strong fingers tried to adjust the time and the gear just snapped.
I have managed to source a replacement gear (with thanks to my Polish friends @ kkpmo), but of course this gear does not have a rectangular hole in it (why would it have that, right?), I had the option to order it without a hole or with a small hole, I decided for the small hole to at least give me a direction as to what is the middle of the gearwheel.
Attached 2 pics, the black one is the original one, the white one is what I have. I am looking for a way to turn the small round hole in a slightly larger rectangular hole, does anyone have any hands on experience with something like this or any ideas? I suppose if you have a set of really, super tiny files, that might do the trick, but perhaps for obvious reasons, I do not have that (I'm willing to purchase them, but I suspect they will not be cheap). On the bright side, I ordered 2 of these gears (they were not that cheap, for else I would have ordered a few more), so I get to mess it up once .
Would love to hear your thoughts on this, thanks!
I have managed to source a replacement gear (with thanks to my Polish friends @ kkpmo), but of course this gear does not have a rectangular hole in it (why would it have that, right?), I had the option to order it without a hole or with a small hole, I decided for the small hole to at least give me a direction as to what is the middle of the gearwheel.
Attached 2 pics, the black one is the original one, the white one is what I have. I am looking for a way to turn the small round hole in a slightly larger rectangular hole, does anyone have any hands on experience with something like this or any ideas? I suppose if you have a set of really, super tiny files, that might do the trick, but perhaps for obvious reasons, I do not have that (I'm willing to purchase them, but I suspect they will not be cheap). On the bright side, I ordered 2 of these gears (they were not that cheap, for else I would have ordered a few more), so I get to mess it up once .
Would love to hear your thoughts on this, thanks!
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