In order for the replacement parts to last, they must be properly aligned during installation! To do this, install and tighten the crank drive end and also the chain coupler, then make sure that the shaft on the chain coupler end has EQUAL amount of free play to each side of the crank coupler! If not, remove parts and file or grind the mounting ears to get the needed free play to each side and up and down, then assemble and check, redo if needed.
If done properly, the drive will be good for many years(30 years on our AC15D).
If not done, only 1 or 2 years!
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