To add a voice to what Ken said-I am not sure the tormek is the best option for polishing the back of your plane blades. I have tried to use the original stone to flatten a blade back and it worked fine. I have one of the extra fine Tormek diamond stones that I use for that process now and it works great-for grinding but not for polishing. To get the polish follow Ken's suggestion and look into the "ruler trick". It works and saves time.