Just wanted to follow up on this thread in case it's helpful to anyone in the future. I got this colony into one of my normal wooden hives, and I was cleaning up this equipment, so I decided to correct all the frame rests. The top picture shows how I had the rests installed, and the bottom two pictures show the rest installed correctly. I turned the plastic piece over, so it was positioned like a ride-side-up L, and then pushed the short leg all the way into the groove cut in the wall. It seems sturdy now, and it would definitely affect the spacing. Still glad I'm getting rid of the stuff, but at least we figured out what was wrong. Thanks to everyone who helped, and a big thanks to Matt for being willing to trade. I'm extremely happy to have all my bees back in my normal equipment.
