This press belonged to my late father and I don't have a key for it. Has a Jacobs chuck RJ4-19L, and the chuck is way bigger than any I've ever seen. Anybody know what chuck key would fit and where I can get one?
Darn head cold this AM ,lets see if this dirty trick will at least give you some idea.
Take a box of drill bits and place the bottom of each drill bit into the chuck pilot hole until you can make out the exact hole dia. information.( Example a 1/4" drill bit will give you a 1/4" inch hole).