I started trying to level the blank that I ripped down on the saw yesterday, I don't have a thicknesser so I saw online that someone had used a long flat beam wide enough to cover the fretboard and glue sandpaper to it to flatten the fretboard. I don't have any timber around that I would call dead straight but I work in the steel industry so this is what I came up with. It is heavy enough that it does most of the work for you as long as you can handle pushing it backwards and forwards, I won't need to go to the gym this week.