C22 Raymarine ST1000+

In June I picked up a used autohelm for $60 off of Kijiji.
I took a chance thinking even it it doesn't work, it would be good for spare parts.
A new unit is over $500.

I hooked it up to 12v, and the display lights up, but the ram would not move.

I opened up the unit and discovered that the stepper motor is rusted and siezed:

Old Autohelm 800 above
ST1000+ below

The ciruit board is different, but has the same connections for the stepper motor.
The stepper motor and ram mechanism are the same.

Will probably Frankenstein the two units together