Ok, thanks! I’ve tried ones again and it works when I have it without the belt and then spinning the whole time. But when I put on the belt, it becomes too much load and then only the outermost part is spinning :((

It is just to buy a new one right? Or should it still work?

I’ve already tried, but I can try it again!
Anyone have a good trick to getting the spline on? I’ve tried with lubricant but after a long time I got angry and started using violense, this was the result… 🙁