Thanks Norm, just as a quick update, I have confirmed that it is definitely the motor at fault and am rebuilding it with new components where possible and will retest.
Failing this, Norm has pointed out there is a module which could be used to manage the speed adjustment and just needs to be fitted in line with the motor and necessary adjustments of pots made to get the right speed level.
I'll update this with the outcome.
Failing this, Norm has pointed out there is a module which could be used to manage the speed adjustment and just needs to be fitted in line with the motor and necessary adjustments of pots made to get the right speed level.
I'll update this with the outcome.