Did you check the carbon brushes Ray?
I have a cheapy mitre saw and the brushes are tight in their slots so after a while stopped reaching the commutator. I took them out, and took some of the sides off them with emery paper, now they slide easily and the saw works fine.
Just a thought
Angie
I have a cheapy mitre saw and the brushes are tight in their slots so after a while stopped reaching the commutator. I took them out, and took some of the sides off them with emery paper, now they slide easily and the saw works fine.
Just a thought

Angie