The best explanation is in Ary’s Motor Break-In How To Video
- As compared to 1/24 open-can motors, the commutator brushes on a FC130 short-can motor cannot be easily contoured/faced with a Hone and/or Turtle.
You would have to remove the wishbone from the plastic end-bell, contour/face,
then re-install – with each step Adding risk to damaging a fragile assembly. - So – using the MMBIR the comm. on the armature becomes your “hone”.
- “brushes” <> Pickup Braids in the context of the MMBIR
(altho it is common to call braids as “brushes” in the context of Carrera and other RTR 1/32 vendors)
"... get on your bad motor scooter and ride!"
Sammy with Montrose