You probably need to replace bearings, rear bearing wears
out first (NMB, IR-14380 alternative KSK, 7R 6). Use straighten out paper clips
to hold the brushes in place when assembling motor. First mount anchor so it's
seated in rear bearing, secure it with (81) clip on shaft outside of bearing.
Then pull the paperclips out of the brush holders, check that brushes slides
properly in to place by turning anchor. Finally place motor field over the
anchor, then fasten rear housing cap with bearing and spacer clip.
Conmen problem is corrosion inside the rear of tail cone,
where (84) rubber cup is suppose to make a water tight seal. If this is the
case, remove (83) ring and (84) rubber cup, use the modified rotary seal from
DPV Repair.
Mount rotary seal base with O-ring, wash seal surfaces
with pure alcohol.
Attention: Do not touch surfaces with your fingers. Slide
upper part of seal down on shaft and secure with clip.