Cars & Other Vehicles How do you use a bead pen? How do you use a bead pen? https://www.youtube.com/watch?v=hDjqhdosPPY How do you make a beaded pen? https://www.youtube.com/watch?v=0CtTHYlgOks What size beads do you use for Beadable pens? Beads and spacers will need a 2mm or larger bead hole diameter to fit onto the mandrel. Tip: The GoodyBeads.com beads and spacers that are labeled “Large Hole” will fit GoodyBead.com bead pen mandrels.1 Jul 2015