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Wasn't sure this little disk would be the right fit for my lathe, but it lined up perfectly with the pulley and bolted down without any wobble. Took me about ten minutes to swap out the old one.

Snapped right onto the spindle of my SC4 and the pulley sits dead flat now, no wobble at all. Being able to match it to diagram #110 made ordering painless, which honestly isn't always the case with lathe parts.

Wasn't sure this would line up with part #110 on the SC4 diagram, but it slid onto the motor pulley without any filing or fuss. The disk sits flat and true once bolted down, no wobble at all when I spun it by hand.