Since watching this, I have tried to make my own brush pen with cheap Flair pens. It works! The grip is more comfortable than just the skinny brush handle. I have also tried it with Tombow double markers (use the brush end) and even with odd parts from old ballpoint pens and foam pencil grips. I find myself walking down the street looking for discarded or lost pens, plastic tubing, or anything which could be used to "Frankenstein" a brush holder.