Custom Pulley Help - ATC over hall

[andy_con]

looking at doing a complete over hall of the 6 station atc on my triac.

I want to change the 6 tool holders to 10 and replace the slow motor that only spins one way with a decent stepper that can go both ways.

all the designing is done and ive hit a stumbling block which I need some help on - a pulley system.
the shaft of the nema isnt long enough to stick out the bottom of the mounting part.

so not sure how im going to get a toothed pulley system to do the job.
but that's all I need is 2x toothed pulleys and a belt of the right length.
as you can see from the drawing two centres are 47.5mm apart



green = part of existing atc arm
blue = new nema
black = new 10 station tool holder
red = dimensions

see through -




solid version



you can just see the atc to the left here



sorry got the white cover on