Replacement Stepper Drives for Replicator Dual Extruder

I recently blew out both extruder motor stepper drives on my Makerbot Replicator Dual Stepstruder. I won't go into the reasons why but wanted to show my repair.

I don't think Makerbot sells parts for this unit (at least doesn't show them on their web site. I didn't call and ask) but would expect them to be quite expensive if they did.

I knew the stepper drive was blown when the stepper motor would just jitter back a forth a single step and the circuit board was extremely hot.

I replaced both stepper drivers with Pololu A4988 Stepper Motor Driver Carrier Boards, Item #1182 @ $5.95 each

https://www.pololu.com/product/1182/resources

These appear to be exactly the same board with one exception. The Pololu #1182 PCB uses a trim-pot to set the motor current where the Makerbot board uses a digitally (software) controlled voltage to set the motor current.

I don't think this is a big issue as it only needs to work, no acceleration is used on the extruder drives so this was no