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adam1973 wrote:

Hi, I bought a couple of pinions, 15 & 18 tooth... They are too small??? Any other ideas?

Weird... always trouble with pinions and gears. And sorry I apparently linked the wrong info.
These ones should match although I find it impossible to figure out what module it actually is :

Tamiya 3515003 15T pinion
Tamiya 3515006 18T pinion