Below is a picture of a used R-8 X2 head I picked up recently. The spindle sticks out nearly 1.75" from the bottom face of the head. My MT-3 spindle only sticks out around 0.85". The near extra inch on the R-8 is a lot of travel to give up on a little machine. The R-8 spindle dimensions agree with a drawing available at littlemachineshop but the whole thing assembled disagrees with most published X2 photos ? The spindle appears to protrude the correct amount fron the top of the head. If this spindle is some variant I am not impressed The other oddity is the coarse thread draw bar that was included.