[snip] But last night it hit me!...Nothing in the cart but juice, a spring, and a small plug. I simply took the spring, cut it about a 1/4" short of the top of the cart and inserted a poly plug.
The spring provides light constant pressure, keeping the poly firmly in contact with the atomizer...when you push down on it it pops back up, so this might be a good alternative for 801 users. [snip]
OH! You're inserting the spring in the cartridge
lengthwise, smonomo. The first time I read your post I didn't get that. OFC! That should work on any cartridge. I bet you can get a fair amount more juice in it, too, and fill less often. And the juice is going to have one hell of a time staying at the mouth end of a cartridge -- as it easily can with using the filler only.
Now, springs would work the best -- as you said the spring would provide more consistent pressure. However, the filler is compressible, too. I bet anything the right length would work. I bet even a paperclip, bent properly into a "U," but with a "Z" shape across the bottom at the filler end, might work. OFC, this would be second option to the springs if you don't have any of them.
Good idea! Thx!
Tim
==============================
P.S. Maybe I should read the entire thread before posting a reply to a message and repeating a lot of what others had already said.