It is possible that the SMDL motor could have a loose set screw or could be configured backwards.
To tighten the set screw you will need a 1/16 allen key.
I will attach a PDF that shows how to replace an SMDL motor.
If you follow steps 1, 2, 3, 6, 7 and 8, (in that order) that should solve the obvious problems that I have mentioned.
If that does not work we can troubleshoot further from that point.
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