I have had good luck with placing a hole in the cart of the 510. Using polyfill at the moment, though did get some Lipton pyramids today. The 510 cart has a rectangle compartment withinn the cart. This is where the filler sits and some onto contact with the atty. The compartment goes half way back to the exit hole (mouthpiece). The air, when pull into your mouth, goes around this compartment and pulls air from the atty holes. The air (in with the poly and fluid) can not be pulled out much because no negative pressure within the compartment can be created. Also, the poly will always remain somewhat wet due to decreased air movement within the compartment. The straw mod helps to fix this, but has a self-defeating effect also. The air within the atty chamber (when neg pressure is present by taking a hit) will pull air from the atty intake holes only. The straw and air around it cancel their own pressure thus having no effect. The stram just allows atmospheric pressure air into the bottom of the cart which displaces fluid as it is used, it also lets air escape the bottom of the cart when filling it allowing for an easier fill. To have a better result I tapped the rear of the rectangular fluid resevoir chamber. This is done by heating a pin and pushing it into the side of the cart from the outside. You want to do this so the whole penetrates into the recangle, not the space where air move when taking a hit (to test, when you are done, cover all exit holes in the cartridge and blow into the mouthpiece end, you should have no airflow coming out of the hole you put it). Now when the cart is filled (it will drain from the hole you put in if oversaturated), and you take a hit, the air in the atty chamber creates a negative pressure and pulls air from the atty entrance holes. At the same time air is pulled into the hole you placed, travels through the filler material to the atty. This helps pull fluid to the atty and increases flavor. You will find the filler gets more dry and you get more flavor. Only use one small hole, enlargen if you want an easier pull. If you place two holes (one on each side), or make the hole too big, you will suck in liquid which is not evaporated by the atty, or flavor will be overwhelming and you get too easy of a pull. This works much better than the straw mod on the 510, I have not tried it with the nylon teabag material yet, but i suspect it will be even better. Not too mention a better hit than the straw mod, you also save room for more wicking material which a straw will displace. I'll try to get some pictures up sometime soon.
