Milling cylinder heads - Crankshaft Coalition Wiki
This photo essay will show you how to remove the intermediate gear and shift lever from the head of a Sieg Industries X2 mini-mill . It also explains why you might want to do so after installing a belt-drive.
Service Bulletin 1008 Minimizing Backlash on Mini …
A problem with the Sieg X2 mini-mill is that the head can suddenly drop down while you're milling. Everything will seem fine until the head suddenly drops a bit, which causes the end mill to try to cut too much metal at once, causing the table to start shaking as much as the play in the gibs allows.