Graphite - scrape an h2 pencil lead into the two wheels - or purchase a small squeeze bottle for three bucks.

Sincerely, Gargoyle

Now if I can only get my 4-track player to "un -gum " the roller wheels and stop eating the "Best of Cream " or the sound track to Easy Rider... I will be a most happy fellow. (Say three times...as fast as you can... "Him smart fellow...he fellow smart....")