Im not trying to be a drag....but a moving dot on a writing utensil really isnt practical.....why not use something different than another pen,marker,pencil how bout a card or your finger.....I just had to voice my opinion....you have a cool Method of a moving dot, i would just apply it elsewhere. Im not trying to bash you sorry if that's the impression. Magic needs to make as much sense as possible and writing on a pencil? just sayin( I see the new video, very good a straw looks great!)
Send me a demo video and I'll see.