sounds like the hammer mechanism works but the spinning mechanism is stripped. if brushes were the problem, i don't think it would power on at all. i think your best option is to take it apart before buying anything for it. i would think the hammer/rotation mechanism should be pretty simple to take apart and put back together. page 11 on this pdf
http://www.harborfreight.com/manuals...5999/45252.PDF is an example of what the mechanism should be like when you take it apart.
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Matt
'96 F-250 XLT,x-cab,4x4,BTS E40D,301k,dana60,Swamps175/173s,Dieselsite Adrenaline HPOP,CPR Fuel system,rear discs,
4" dp to 6" exhaust w/ twin 6" stacks,Tymar,Autometer Lunar Boost,Pyro,and Tranny Temp,white-faced gauges,
intercooler,diamond headlights and corners,
onboard air,
HX mod,Twildman 6-position chip
NRA Life Member
North-South Skirmish Association
"Gotta love the fresh smell of diesel and black powder in the morning!"
2012 VW Passat TDI