Hi Brex and welcome. MW was like Sears in that they didn't manufacture anything that I know of, they just bought in enough quantity that they could get it rebranded with their name. It's very old and the chances of you finding it from a parts or repair service are close to zero. Probably the only chance you have is finding one on a derelict machine which isn't much better chance.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.