I didn't want to post this until I received these gloves and made sure they would work for this. This makes the cotton ball cover idea even easier. You can get a pack of 60 of these white cotton disposable inspection gloves for only 20 dollars here (
http://www.amazon.co...duct/B004THMZJE). Using all five fingers, you will get 300 cotton ball covers out of one pack. That's less than 7 cents per cotton ball (14 cents per test tube). They are the perfect material and size. Sure after enough time, some larger stronger queens could possibly chew through them, but it's yet to be seen how often that would actually happen.
Just cut an inch and a half or so off the finger tip.
Stuff the cotton balls inside them like a little pillow cases, and then set the tube up as you normally would.
One other added benefit (mainly for those who use smaller cotton balls), is the sort of handle on the cotton plug this gives you. No more picking at the cotton plug because it got pushed too far inside the tube.