I bought my Bernina in 2000. Lots of use and after the warrantee ran out, I never had it serviced.
When I was in St Petersburg Russia, I stayed with a woman who taught English at a university. She had a new electronic machine -- but used her "old faithful" -- a hand crank singer knockoff called "Red Revolution Company". It had started out as a treadle, then electrified and then she changed it to a hand crank. She said that it sewed straight stitches and the new stiches were a little offset.
In the pix she is sewing curtains.