That’s great ideaI made a diy puller which worked first time I put it on. pics attached, basically 10mm plate drilled for the four mounting bolts and the centre one tapped and a point put on the end of the middle bolt. Then just tighten each of the four bolts in turn. No heat required.
I take it you took off the securing nut on the end of the shaft.
View attachment 119240
View attachment 119242
View attachment 119243