You should replace the trans and all motors. I find cordless shade parts difficult to replace. I have damaged more that one replacement part, when repair one shade. No returns or refunds on all cordless shade parts. It's best to replace all the motors and the trans. To replace motor or trans, pull shade down. Lock up motor, so not to release the tension. Remove trans with motor. Replace damaged parts and reinstall. Remove any locking pins or motor locks.

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