| A ½” impact wrench works the best. There is just a tin fan behind the pulley which might bend if used to keep the rotor shaft from turning. The pulley has no key so it can rotate on the shaft as you found out.
If you don’t have access to an impact wrench there is a trick you can try. Put a 10mm ¼” drive socket inside a 22mm socket. Stick a ¼” drive extension through the ½” drive socket opening into the 10mm socket. Connect a ¼” drive breaker bar or ratchet to the extension. Use this on the 10mm hex on the end of the rotor shaft to keep it from turning (set to tighten direction). Use a pipe wrench, vise grips, channel locks, whatever to get purchase on the outside of the 22mm socket and turn to loosen. If worse comes to worse you might have to rough up the socket to get a bite on it.
Hope this helps.
Bill
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97 40th
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