I planed Sang Mu with a traditional carpenter. I was able to plan at first, but then Sang Mu planed very smoothly and the plane skidded on it.

This angle cannot be adjusted. Imagine the old carpenter who works with only one plane?

The planers commonly used by old carpenters are divided into seam planer, second precision planer (ordinary push planer) and net planer.

You can only use a broach plane or a clipper plane to level it. If you want to clean the material further, you must use a cleaning plane (commonly known as "plane" locally).

Since there are several planes with different names, their angles are naturally different. Inch by inch, inch by inch, inch by inch, inch by inch, the angle determines its use.

I don't think it's possible for you to dig a plane yourself, and it's not easy for anyone to get one. It also involves whether the flowers are pinched or not, and the research and pressing of the cover is also very knowledgeable and needs teachers.

Buy a net planer, or simply get a grinder to polish it.