I have a Stanley No. 20 circular plane that I have been using for some time now and I find the mouth to be tight.
I am using a Hock iron, which is about 0.020" thicker than the Stanley iron, which does eat up some of the mouth opening.
Since there is no way to adjust the frog, has anyone filed the mouth to open it?
Is there a reason that this should not be done?
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Regards,
Phil