oh! are there more than the ones that go at each end of the glass tube?
pssst: have you had a chance to compare the ARCO bcc and the DBox Dubes? i mean, i'm getting some dubes, but when i saw your comment on the ARCOs, i was thinking...maybe 1 or 2. someone in a dube review said the dubes were better, but if you like your own tips, you might automatically think that anyway. interest in your POV, if you have one.