I have seen the clothespin trick, but it's not for me. 1st, it's wood which I don't trust when sanitizing. Second, these are things that can fall into my beer: I'm clutzy, and they will fall into my beer.
Here is my earth-shattering DIY holder. Drilled out the center of a carboy cap with a 7/8" step drill bit.
Here is my earth-shattering DIY holder. Drilled out the center of a carboy cap with a 7/8" step drill bit.