Quote from badboylookout :

I had no problems my self, but I would say only press on the center and not on the sides. That is because the outer ring is really fragile.

Yeah it is very fragile. I am going to roll up a piece of sandpaper and just run it through the middle a time or two lightly to see if that helps (if it is that tight again).

Quote from badboylookout :

For the people that still have this issue, you can buy a printed version here: https://www.shapeways.com/product/4FDSWS6CS/encoder-g25-g27-60-slot

It worked great for me, it shipped within a week and I'm using it now for over 2 years without any problems.

This guy sells 30 and 60 slot versions
60 slot is for G25 and early G27 later G27 wheels use the 30 slot version.

I bought that one a couple weeks ago and it ended up broken, so I got a replacement, but my question is, how did you get it on? The first one I tried and it was so tight that I think that is what caused it to break. Any tips?