If you have a belt sander just put it in the sannder and just wait untile it gets to the thickness you want.

If you dnon't have out use a rasp and just rubb down the sides or a planer would work.

or just a peace of ruff sand paper and just rub the sides of the box call on it and

go to smaller sand paper as you go.

Well Good Luck to you.

And if you would email me on how to make them I would like to try it.

jrbsr