If you do not have a mill go get one

For me i just used a credit card…Have the rollers touch the card but not tight…the card should be able to move freely between the rollers while making contact with the rollers…This method has given me a nice crush and get 85% efficiency and no problems…enjoy cheers

Thank you

Auto parts stores still carry them, you need feeler gauge sets for most engine rebuilds still. Cheers

P.S. Most good sets go from .001 to .71, made from brass up to .015 and steel for the rest

I still have mine at the factory settings after 18 months.