Hi, I got hold of an old '97 Mazzer Major (Rio badged) for $250. I am sure it is an old SB grinder 'cause there was a sticker on it that said so........ Anyway, it has a bit of a buggered up thread in the body casing threads where the burr carrier threads the top burr. It got shipped poorly and part of one of the threads about 1 1/3 turns in, is a bit broken(i.e., the peak of the thread snapped off for about 1"....... the groove or valley of the thread is still there). Unfortunately this is right where the gap for the spring is, and so when I tighten the burr carrier(counterclockwise), it feels like it gets tight right at the bad thread and doesn't want to cross the spring gap into the continuing same thread path. I don't want to force it, and bugger up any more of the threads...... I am wondering if anyone else has had to clean up some threads that were broken or crossed...?? and what they found out worked. The threads on my machine are not crossed, and I want to avoid that by not forcing the carrier when it gets tight.
I have marked where the threads begin on both the carrier and the body, and that is how I came up with 1 1/3 turns in. I have used a small triangular file to delicately "clean-up" what is left of the thread where the peak has broken off.
Anyone have any experience in a thread fix like this? I know it is fixable, it is only a small part of the thread circumference.
thanks in advance, Clay