Hi Bojan,
I simply used the stepper that was in the mount, fitted the new pulley after removing the transfer gears. The worm was turned down on the side that the pulley was mounted to make it easier to fit the pulley - it is wider than the standard gear) , also had to dremel out the slot the gear protruded through a bit so the pulley could fit. The pulleys are 2.5mm pitch 47tooth and 12 tooth from the link I posted in the older thread. Have no pics...don't want to take the mount apart again
cheers
Gary