Tank #2 appears to be a success; got a 4 pack of 20ml syringes at Tractor Supply; didn't want to risk one of my few remaining Boge 510 cartos so I uses one of the Boge 808's even though I haven't had much luck with them; cut the tube, punched the carto & the plunger caps, put it together, filled it, and started vaping; haven't seen any leaks yet, and it's working as well as any of my other 808 cartos. That is to say, a little vapor but not nearly enough. If it's still functioning in a day or so, I may risk a 510 carto.