Cat, the probe comes into the side of the incubator and I have grating type shelves, I just hang the probe and keep it in place with one of those ties they used to tie up wires etc.

I use containers that are sold by Superior Enterprises. They come with the holes prepunched. I don't have extra water in the incubator. I just mix the vermiculite so it clumps, kind of old school. I don't measure or anything I just know the feel. I rarely need to add water. Once in a while I'll get eggs that look dry and I'll just spray the wall of the container with water. They don't seem to loose too much water over the 60 days.

I've heard of people using a wedge but I've never done it. My egg boxes only seem to steam up the first couple days as the egg/box/vermiculite adjust to the incubator temp. They also steam up at the end as they warm up. That's why I poke the holes and check every few days and wipe the lid dry.

Hope that helps