HANDY CARABINER HOOK: Securely hang the eyewear case inside handbag to avoid endless searching.
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The Ali Express gear was 4.2 mm which I grew to about 4.4 mm by the hammer treatment (I did not dare to go much further to not deform it too much). This time though I first increased the width of the gear by the 'hit it with a hammer' method as described in this post. To fix it I used one of the Ali Express gears again. Exactly what the previous owner mentioned and I measured myself The skipping of the teeth also explained the ticking sound it produced while running. This made it effectively an 11 teeth gear instead of 12. The pinion had lost two adjacent teeth, which allowed it to skip a step. It had the same root cause (a broken gear), but a different failure mode.
When I bought it I could not yet think up what what caused it, but once I opened the motor it became immediately clear. Today I bought another 431, this time running too slow, about 5 seconds per minute. As you can see in the pictures there is not much room for error as there is little left of the gear. When that was done it was still a bit too tight, so I used a file and the drill again to make widen it until it fitted tightly on the bushing. The advantage of this is that you feel what is going on, correct the direction and can stop/let go if the drill takes a too deep bite in the plastic (the gear is tiny so the drill is comparatively huge). I tried several way of keeping hold of the gear while drilling, but in the end felt the safest one was to just hold it in my fingers while using a power drill at a low speed. So I needed to drill a 2.5 mm hole in it. Then the hard bit: the gear has an inner diameter of 1.2 mm while it needs to be mounted need on the metal bushing of 2.5 mm diameter. I first scraped away the remains of the old gear. The outer diameter is a little less than it should be, but the closest I could find.
It has 12 teeth, outer diameter 4.2 mm and inner 1.2 mm. After a long search found a more or less matching gear on Ali Express (some part of a model quadcopter):