24-05-2020, 11:10 PM
(This post was last modified: 24-05-2020, 11:12 PM by Bob Culver.)
The normal acceleration is very violent. The brushes must have travel remaining and be free to move.The spring clip is quite critical. If too loose the pinion wanders into mesh on grades, then violently oscillates in and out until it chances to catch and settle. The sound effects can be very mysterious. The recommendation was not to oil, although I have always used very thin oil.