Hello,
I like to present my latest project, the Märklin 216 025-7 with the old big slice collector motor. I own this model since about 35 years, digitalized four years ago with an Esu LokPilot V3 and Esu permanent magnet.

1. Ball Bearings
To improve the driving performance, I planned to install ball bearings to the motor shield. This is not so easy like it is with the standard drum collektor motor. The diameter of the anker axle is 2mm. Therefore, You need to use a 5mm ball bearing!

I drilled first with a 1.5-4mm center drill, then I did the final drilling with a 5mm drill bit:



With slight pressure, the ball bearing fits well into the drilling hole and needs no superglue:


This is the best position for good driving performance, the snap ring holds the anker in place:


The rest is standard for digital conversions:
- Esu permanent magnet
- test DC-Motor with DC power withlout digital decoder
- conncet digital decoder and optimize motor settings
Video vom Motor und Fahrtest folgt später...

2. LED rear lights
There are no openings for the rear lights in the case of the Märklin 216 025-7. You have to drill the holes by yourself and fit fiber optics for the rear light :



Then I used UHU Alles kleber Super superglue to fix two red SMD LEDs onto the fiber optics:







And here a first test with fiber optics mounted and 9V battery:




To be continued...