It got to the end of the stroke with the power feed & jumped the track in there so that it no longer moves left to right. I have heard of this happening before and in fact seen it, but I forget what you do to set it to rights. I have this vague memory that there is a collar in there that encloses the worm gear that is designed to separate in extreme circumstances. This is an old change belt drive model. With an Acu-Rite DRO. Where can I go for guidance? Thank You,
-plh