Peter. If there are parts that are seized up and it would seem that there could be, It would be best not to power it up. The motor turns a friction drive and powering it up could seriously damage this and you wouldn’t want that! The only thing I can suggest is that you strip it down and free up the parts that should be moving with penetrating oil. Be careful not to get any oil on the two timing cogs as these are friction driven and need to be clean but free from oil. l don’t know how much help this info is to you but by stripping it down will give you a good insight into how it all works!! I will just say that if you let the on / off switch soak from the top with penetrating oil you should be able (with luck) and the help of a couple of small levers, raise the knob enough to clear the block with the locating pin in it and then be able to remove the block. You should then be able (with a bit more luck) to push the knob down enough to remove the small collet and then remove the knob. You should then be able to sort out the problem with the switch. I would suggest that this be the first thing you need to do.
Good luck!
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