I have heavy duty metal shelf supports I will bolt to the wall and have a 2x12 I will use for the shelf. The lathe weighs over 100lbs, hopefully it will be stable.
As for the pin knot scraper, I thought my build along was in the how to section but it is not. It has also been removed from the archives. I can post it again if there is enough interest.
The pin knot scraper is made from a concrete nail, heated and annealed to soften, pounded flat, shaped filed almost sharp, heated and quenched to reharden and buffed to a razor edge. You can work around osage pin knots easily with this tool.
Another view.