Old deluxe starter given to me last year. Worked fine until I tried usingit this year.... spins but no torque...
I took it apart and cleaned the contacts in the shaft, I did not replace the brushes, I did try stretching out the springs and also added a little piece of credit card behind the brushes ( thinking to add pressure to push the brushes towards the shaft ) I also filed the switch contacts clean... put it all together but its no better...

I'm guessing its toast? is it worth getting new brushes?

pop