I'm relatively new to pen making and recently got the Whiteside barrel trimmer. I like that it gets the end of the blank dead square to the tube. But, I'm still trying to figure out what method to use to quickly trim the end without accidentally trimming the brass tube. So far it's been trim, check, trim some more, check, trim some more, check. OK, you get the idea. Anybody got a tip to get it dead flush to the tube without over-trimming?