I realize I am reviving a rather old thread...
Be very careful in using a puller to remove the pulley/flywheel from one of these sewing machines. I was silly and tried it following internet advice (ie, this thread), and while it worked in removing the pulley, it also jammed up the sewing machine (I have a 211U566). On my machine, the part not budging was the pulley bearing in the machine housing. So banging on the pulley with a plastic face hammer would have been the right thing to do. If the pulley is stuck on the shaft, a puller makes sense just to crack it loose.
There is enough axial play around the front shaft bushing to allow parts to get bent at the needle end of the machine if a sufficiently large force is applied, such as when using a puller to remove a stuck pulley bearing from the machine housing. In my case the take up lever got bent (the hollow rod that is part of the take up lever, to be precise). It did not look out of shape to the eyecrometer, but it was sufficiently out of whack to jam up the machine. I discovered this by reassembling the machine with different parts missing until it no longer jammed up...
Measuring the take up lever rod showed curvature in the rod as well as the rod no longer being perpendicular to the axis of rotation. I was able to get the shape back to where the machine runs fine, but it took quite a bit of careful work with an arbor press to get there. And obviously a lot of disassembly and reassembly.
If you must use a puller, I would suggest removing all the parts that might get bent first. It's less work than fixing bent parts after the fact.
