OK, here we go...
I have an older 12mm plane that has always worked well with little jamming and loading up with un-cleared shavings. My 10mm plane (and other newer ones) tended to clog very often. Here is the difference I found and what I did about it, in brief compared to the version on the old web site.
You can see that the curve that leads down to the iron is steeper with a much smaller radius on the 10mm cap iron. That is part of the problem...
...But this is also a big part of the problem. The 12mm one is milled smooth so that it makes good contact with the iron and does not leave room for th deges of chips to lodge between the iron and the cap iron.
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