Okay, so I'm frantically shopping for an egg turner for my hova-bator. This bator is an OLDY but goodie...it's the square, forced air model. So my questions are...do I need an expansion ring to use the auto egg turner with my incubator? The top is much flatter than the new, bubbly-looking bators... Also, when it's day 18-ish...do I unplug the turner? Or do I need to take it out & put the eggs back in to hatch? I would think that would be messy, if they hatched on the turner?? Thanks! Oh and BTW...if anyone has a turner for me, for cheap, please let me know! I'm still shopping and need it ASAP!