The Home Machinist!

when the mounting plate comes off, underneath are the three screw heads, going through to the front of the chuck. There is also a dowel, offset, but parallel to the screws. i can take out the screws easily. the dowel, no. this chuck has only one pinion. i have been told that one pinion is better for...

I am trying to get my 3 jaw apart to clean it up. The back plate comes off ok. Then there are three socket head screws and a dowel pin. It doesn't seem to want to go any farther than that. It came from a high school shop. Probably made in the fifties. Also, I've got the pinion out. Am I making a big...