j have a van norman model 12 that i mounted a bridgeport model m head . i used the overarm bar to attach the head.this head has made the machine more fun to use. i can remove the m head in about ten minutes if i want to use the horizontal mill function. i have lost the ability to tilt the head in the y axis but the van norman head will do that. the m head lacks a back gear and spindle brake but that hasnt caused me any problems. the spindle is no 2 morse taper and collets are readily available . the motor is 1/2 hp 3ph so you will need a vfd or phase converter.good luch with your project.