I have 10 machines: 1 long-arm, 3 singers (1953, 1955 and one I bought 4 years ago brand new), 1 Singer treaddle, 2 Brothers and varied others, 4 sergers, 1 Professional Zig-Zag from like 1940-ish and I have NEVER sewn over a pin. Not once. I've always feared doing it. I've seen people do it but I know I'll do it and break something. But I've heard not to sew over a pin on the new ones because it will knock off your timing.