Tony,
i guess the Weltrol is a Darstaed one? They seem to be too high. I removed the bogies, and, from memory, turned off the half-round ring that tops the central casting. This was quick & easy and lowered them nicely on mine. I can take some pictures next week if it would help.
I suggested to Ellis that they fit a washer to the coarse scale ones and make the fine scale ones right, I don’t know if they took up the suggestion for future designs, but I guess there would be no case for changing existing tooling.
atb
Simon