I own three sewing machines, all mid century imports. I've used a Japanese Stradivaro Deluxe for several years for sail repair and covers. The clutch is starting to slip, maybe because I've over-worked it on heavy cloth. I'm thinking of springing for the Sailrite LSZ-1. There is also a second hand Sailmaker (Brother 652) I can get for a hundred or two less. For those with experience, what do you suggest?