Don't think I've even seen glow scales with pen, but I believe the original removable pen should fit in the tweezers' slot. Don't know where you'd get one though.http://www.sakwiki.com/tiki-index.php?page=Pen
Add an Inka pen to the mix Got me out of a fix no end of times, and I've even used the metal tube for blowing down to help get fires going/restarted. Just don't do what I did and spit the bugger into a pile of hot ashes when off your cake on red wine - tends to make a mess of the threads - and hurts your fingers when you get it out too!!