Please can anyone tell me if there is a difference in size between the vertical milling head fitted to the Tom Senior M1 and the Junior mill? The circular mounting boss, marked with degree graduations on the Junior I am looking at is 130mm in diameter and has two loose mounting bolts still attached and I am keen to know if the M1 head will fit it or if the head is a much smaller version with a different drive arrangement.
Thanks,
Jeremy.