Aciera Old Style F3 Spiral Milling Gearbox

I have a spiral milling gearbox and differential dividing head for old style Aciera F3. The gearbox contains the Module 1.5 transfer gears, one 56 tooth Module 1 change gear and an abused 28 tooth Module 1 change gear which was mounted on the dividing head drive shaft. All but the 28 tooth gear are pristine.

I've posted a wanted request for a full set of Module 1 change gears.

My setup includes 3 arms, two with 32 tooth, Module 1 idler gears and one with the 56 tooth, Module 1 change gear. Is this a complete set of arms? There's a clip inside the gearbox cover that seems it might be a storage location for an arm.

I seem to have all the bushings need for the hardware on hand.

I have no detailed documentation for the gearbox.

I'm looking for a photo of a typical change gear setup to compare with my hardware as well as any documentation listing practical gear combinations. I've made a spreadsheet for gear combinations and resultant milling pitch but not sure that it reflects the intended gear combinations. I have the list of 12 change gears and the overall pitch range from a brochure page.

There's one interface problem. The gearbox mounts properly to the X-Axis lead screw spline and the gearbox mates flush to the end of my 331 table; however, the mounting hole in the gearbox is about 3/4 bolt diameter off from the tapped hole in the table. Does this suggest a gearbox version mismatch?

Thanks