I would like to turn my first bike, a 1972ish Moto Grand Record, into a 1 x (10?). Right now it's a beater, so I stripped it down and want it to be something I will actually enjoy using, probably including a powder coat new look and hand-paint the lugs. The rear dropouts measure at 120. I know a modern wheel with cassette needs 130. I've watched RJ Bike guy's videos about cold setting. I'm guessing the real risk is the brazed brake bridge and chainstay bridge? As well as general alignment? Any additional warnings/advice about trying this? Thanks.