i make a lot of pens and the simplesest way to do it . is after you turn and sand before you start your CA finish take the bushings off and they make CA bushings they look like little cones that are made of nylon . one on each side of your pen pieces leave you plenty of room for the CA. after your done with the CA application i take the pen pieces off and re ream them to square up the ends then place them back on with the nylon bushing for final wet sanding. the CA cones are sold through Penn state industries. the cones i think were about 6 dollars for a pack.