I'm really sorry to hear that. Were you feeding to the left so that you ran out of threads on the leadscrew?
When I was cleaning and reassembling mine, I noticed that there's an automatic trip(drive trip pin) that will push the drive engagement pin out of engagement independent of the trip on the front of the table when feeding the table to the right. This seemed very strange to me, as that's the climb milling direction, which is FORBIDDEN in many places in their documentation. When I was feeding (by hand) to watch the trip happen, I found that my table binds dramatically about 1/8" from the trip activating. If I'd been counting on this, I would have blown up something on my mill. You may have saved me from the same fate! Thank you!
For now, I think I'll just put in a longer drive trip pin to be sure I don't mess up.
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I was looking at the parts diagram and couldn't find the M6-161-20. Do you mean M6-101-20? The small gear on the inside of the middle shaft of the outer three gear sets?
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If that's the right gear, don't panic. They do come up on ebay, and sometimes at reasonable prices. Three sold on 1/29/16 for $17.99, and 2 sold on March 24 for $14. (plus shipping in both cases).
There's one for about $30 right now:
http://www.ebay.com/itm/Unused-Craf...539232?hash=item35ff3e4b20:g:Vj8AAOSw3mpXEmnk That link is strange, as the title says unused, the item condition says "used" and the description below says unused.