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There are caps covering the worm rollers. 2 on the control board side and 2 on the blank side. If you use pointed pliers to remove the cap from the control board side you will see the end of the worm roller. Don't remove the other side, it holds bearings in. With that cap off you will see if the dec worm roller is moving. Dab it with a felt pen as they move pretty slow but with guiding off, it should not move. The dec would be the top one.
I use phd to polar align.
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