The broken stepper motor is from work so I am not too fussed about it
And it was only $50ish.
But I will measure resistance and try opening it today as Bojan suggested. At least I might learn something new. Will let you know how it goes.
The main problem was the mis-advertised torque on the Farnell website which I could not get and in the end, to increase torque I gave it a higher voltage/current... it was running fine for a week and then started giving problems.
With all the lessons learned, now I am more cautious with my telescope mount motors but I cannot seem to find any info on them at all. Hence this thread.