kristin,
Whats the purpose of the straw in your PTB mod? If the PTB was pushed into the cart without the star would it work the same?
It actually serves a couple of purposes:
1. Helps keep the material close to the bridge, without it, it tends to get pushed too far into the cart after awhile. It sort of "holds up" the plug end.
2. It allows you to use less material, by narrowing the space & holding the thicker part at the end. You can get two carts out of one tea bag. Otherwise, you'd have to use two bag pieces to avoid leaking.
3. It holds the smaller part of the material in the cart, narrowing it and allowing the "flowering" effect at the end to envelope the bridge and open enough to plug the cart and lessen leaking.
4. Less material in the cart to hold the liquid back, especially with thicker liquids and you have less material in the bottom, allowing the liquid to flow more freely. Otherwise you'd have to use two pieces and that holds liquid, causing more topping off and less flow to the atty.
I did try it without the straw and it leaked a lot and the bridged pushed it back too far - it's not stiff enough to hold up against the bridge by itself. I tried using the whole tea bag to counter that and it was just too much material. It held on to the liquid.
The less material you can use, the more liquid you can get in and the easier it'll release the liquid to the atty.
Like other PTB mods, this does eventually gum up and start holding liquid. Unlike those others, it takes longer to get to that point (less material & folds) and is VERY easy to pull out, rinse, dry and put back. It's hard to do that with something that has been rolled, folded and shredded all to heck, lol. The straw never really had to come out once it's in place.