Here are the plans to build a simple and effective fleshing beam:
The picture of mine are a 6 foot long planed 2x6 bought from andwhere that sells lumber. You could aslo just use a log from a tree, 2x4, etc. Try to get a piece of wood as straight as possible and fewest knots as possible. I then used a paint can to trace the rounded part at the front. From their i just cut it (with a handsaw) as close to a smooth curve as i could. I then rasped the edges (could also use belt sander, etc.) to a smooth downward curve. Then all you have to do is sand it smooth. I went from 60 down in sandpaper. Here are som pics.