I run my 10 wrap 3mm 26g 1.3 ohm cotton wicked single coil directly over one air hole and plug the other hole Lancia style with an old bottom pin from a used Aspire BVC coil. I wrap a tiny piece of aluminum foil around the BVC pin to get a snug fit. Metal plug works better than cotton plug method, as the cotton can become saturated with juice and spoil things when you want to change flavors. Prefer the Holmes now over my Magma because the flavor is similar and the Holmes holds more juice and is more leak proof. With plugged second hole you can drip through top cap with little risk of leaking.