Hello Mauriger, welcome to this special little club, You did the right sequence to understand why the shift hub wouldn't let it fully engage gears, very similar to a car gearbox, when it is shifting. File polishing reassembly test .... Is file polishing reassembly .......
The knowledge about this forum and the members who support it are remarkable.
Your color scheme on your turn, you must be commended. The Mulifix if I can ask what size ..... i guess it is Aa and what company did you choose to buy ..... cost .. ????
You have a ride that will serve you all your life.
Good luck the Beagles.