So my helpful little flock of velociraptors knocked one of their waterers off the heat plate the other day, and then I couldn't get the vertical nipple to stop leaking. (I have 2 chick waterers from Permier 1 and both had been working perfectly until the assault.) I have a package of Rent-a-Coop horizontal nipples that I intended for when they're bigger, but it turns out that they also fit the hole in the chick waterers. So they can just go to the same familiar waterer (now hanging securely) and peck at this funny new red toy - they figured it out right away. They're 3 weeks old, and I'd guess the bantams are about the size of day-old large fowl, and I definitely saw at least one of them successfully drinking from it along with lots of the standard size chicks. The second waterer is also hanging now but has its original vertical nipple because I'm more interested right now in ensuring that everyone can stay hydrated easily than in finalizing this transition. Just in case this accidental lesson can be of use to anyone else! 
