CNC4NEWBIE linear z upgrade question

So thinking about upgrading to this Linear z

My question is , has anyone with a newer x-carve “with the pressed on pulleys” done this would I need to buy a new stepper motor, or will the old one work if I cut the pulley off? I notice the ones that inventables uses has round shafts and most others have a flat spot for a set screw…

I made a little puller to remove the pressed on one. Ground a flat on the shaft for the set screw.

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Cool that’s what I was thinking, figured I’d just grindva flat spot or drill and tap a hole for the set screw