Yesterday, I received a PSI catalogue and was intrigued by the number of different pen designs offered. I have built a couple of pens from Woodcraft and, so far, have three sets of bushings. My question is concerning the diameter/size of the pen bushings used to turn the blanks. There are some pens at PSI that are similar in shape and size to those at WC. I don't want to duplicate bushings if I can avoid it. I'm cheap, remember! How do you folks who turn a lot of pens approach this? Thanks.