Belt guidance

No, I didn't press the pulley on at all, I simply cut off the front of the double pulley that was on there. Am I not speaking English or something....? We seem to be caught in a do-loop of some sort.

Was it a good idea to remove the shoulder so a puller will no longer get it off? Probably not. Will it throw it off balance or ruin it? No, it works perfectly and is aligned as it should be.