Mikey, please double check to be certain of several things: Are the teeth perfect? Is the old gear + spacer the identical width to the X Factory gear? Is the shaft bent at all? Is there any sort of burr or deformation where the two bearings go?
We have never had an issue with a single #5210 top shaft. They are made for us by M.I.P. so you know they are top quality. If there is a problem with the part, please return it to the store where you purchased it for a replacement. If you are in U.K. I know X Factory U.K. will take care of the model shop. If you bought it some place else, we will take care of the shop.
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