Motor to power sewing machine or overlocker

I've visited the shop a few times, staff are always super helpful and willing to give their time to talk through options. They've provided no longer in production parts for my ancient Singer and offered advice to my husband on a fault it had. This is my second machine purchased, I recently bought a Brother overlocker recommended by staff, which has been brilliant and another Singer sewing machine (the ancient machine is still in repair), can't wait for it to arrive