Hi Costas,

Thanks for your liking my documentation.

Your question is a good one re milling the magnet. I have done six crocodiles and haven't had to mill the magnet at all. The locos all run on R1 (360 R) curves in both directions without problems.
To confirm this I had a look at all my crocodiles to ensure I hadn't milled the magnets as these conversions were done some time ago.

All I can suggest is Märklin may have changed the tooling to improve the turning movement.

I do note that on your conversion the choke is very close to the milled area on the magnet (see Choke position 1) and some of the wires are in that area also which may restrict the turning movement. In the second photo (Choke position 2) the choke is mounted further away from the milled area, but since your locomotive runs well you have done enough milling to suit your case.


Choke position 1


Choke position 2

I also note that you have used Märklin wires which are thicker where I have used ESU wires that are thinner so this may also contribute to less space for movement.

I think the bottom line here is if the movement is restricted look at things that may restrict movement, change the arrangement of components and as a last resort mill as little as possible to improve the turning movement.