C. Scott
Member
It's probably already come up, However, I discovered something quite be accident in preparing blanks for Sierras.
A 10mm tube will fit perfectly inside the Sierra tube (without binding). Then you can use your pilot shaft for 10mm tubes with your pen mill to achieve blank "squareness"
Even a blind hog finds an acorn.
A 10mm tube will fit perfectly inside the Sierra tube (without binding). Then you can use your pilot shaft for 10mm tubes with your pen mill to achieve blank "squareness"

Even a blind hog finds an acorn.
