I cut holes in the bottom of a styrofoam 1doz egg carton, for drainage just in case, and cut the lid off it. Then I cut a section of 3/4" PVC pipe the length of the egg carton and hot-glued the pipe to the underside of the egg carton, long ways. The carton sits on angle on the PVC and the wire, and I just lean up one edge of the lid and rock it the other direction every so often.
It moves your eggs up higher in the incubator, so you'll want to adjust for what the temperatures actually are there apparently. I have a second egg carton, done the same way, in my LG Still Air with a PC fan added in, and I tied my zip-lock rigged water wiggler to that egg carton so it doesn't fall off. That's where my main thermometer is, tucked into the water wiggler, with an alarm set to go off if the temperature gets too high.
So far it seems to be working. I could fit three egg cartons in the 'bator, and with the water wiggler in place I could probably incubate thirty eggs or so at a time, if push came to shove. I'm currently just running with eleven, though. However, I sure would hate to be hand-turning even just those eleven!
Lots of people put a book or a 2x4 under one side of the bator and just move it to the other side to lean the incubator the other direction. I have cats, though, and was afraid not to have the incubator sitting firmly flat on the table.