This question is for both of you. Just how slow are you trying to run the motor? I understand running the machine at slow speeds to help learn how to sew, but turning the motor down so it barely moves completely defeats the foot treadle, which will not help you in the slightest to learn how to sew.
When you started driving, did you drive at 1/2 mile per hour because you were new to driving?
No one lives forever, the trick is creating something that will.