I wonder if kerosine or diesel oil would be a better penetrant than 3-in-1?
(Always assuming you can't get 'proper' penetrating oil, of course.)
I'd also be wary of damaging the internal(?) thread on the shaft if you back the screw off to fit the puller. Perhaps adding a couple of flat washers to the end of the screw so you have a solid support and no pressure on the actual thread?
If all else fails and it won't shift, the square knob is presumably identical to that used on the WS19? (Check the part numbers first!) That could be sacrificed to protect the shaft.
Best regards,
Chris.
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