Just to throw you a slight curve ball,

I have a manual series 1 that I fully stripped and rebuilt a few years back, so I an very familiar with it.

I recently purchased a series 1 interact.
The head and 90° bend casting, bolt onto a std serues 1 column, with rhe usual 4 bolts ( and 2 dowls).

If you can find one, it should go straight on. And they are usually QC 30 too��.

They are a variation of the vari speed head, but most people (my self included at some point) pull out the vari pulleys and fit timming pulleys. ( usually 2:1 ratio unless you alsways want increased high speed. Possibly uprate bearings too) and speed control via VFD, controlled by CSMIO ( as you probabky already do.


Also, fit the auto oiler too, id you go this kind of direction.