i dont know if anyone has said this yet but i love it and it works great:
Take one of those super big woodcraft markers and take everything apart then empty out the paint and you will find a little marble like the ones from grade school days hold on to it and get some of the speedball ink from michaels (its small enough for the pocket and just right for one marker) its perfect amount for one marker, dump that shit in there and put that gradeschool marble in there again throw the pieces together again and BAM! a great marker for stop light control boxes and signs anywhere it has worked great for me so far i'm gonna grab some more speedball ink and do it again shortly... you can juice it and get some good drippy tags or you can just ink it up just enough and get goos clean tags... either way everyone can get speedball ink and woodcraft markers for free (RACKING) and its nice to have!!! Good Bombing!!!