I'm so loving the posts that the ADM mod is working...we are not a clicky pen house so I'll have to go to the dollar store! Think it'll work with my 801 blank carts I was SURE I'd need?? I love my penstyle but only for dripping, have 510's I'll definitely try the mod with. Is the 801 cartridge space too big to hold all that liquid back with just a spring and poly ball? There are times dripping in public makes me look SO an addict, it would be nice to have a satisfying cart set-up...I'm a Substance Abuse Counselor by day, funny huh? 8-o