I have a piece of wooden board in the shape of the following image. The unit is in centimeters. And the board is 2.5cm thick.
On both sides, I've cut a 45-degree piece off using a Japanese pull-saw. The edge cut is not bad, and I did manage to saw according to the lines I drew. But when I try to attach two of such piece together, you can tell immediately that the 45 degree edge is not in perfect angle. It's not perfectly flat either.
I can't use a plane to flatten the edge because of its shape. I couldn't get a good grip, and the edge seemed to be pretty rough.
I've been trying to use a handsaw to fix the edge by attaching it to the edge while carefully sawing. It only solves a part of the problem. Is there a better way to flatten the edge (hopefully without a router)?