After having lost those 2 chicks I remodeled my MHP. I think I have it down now. I have had no accidents (knocking on wood).
I left the wire on the top of the pad attached with 4 inch cable ties. I have the entire pad wrapped in Press-n-seal and taped so it cannot open.
I have a cage I made for the chicks for their first week. It is not big enough for them when they get any size.
The cage is 16 inches by 32 inches. The reason for that size is it fits the shelf I put them on. I knew my DW always wanted chickens in the living room!...
I used hardware cloth when I made the cage, I simply run dowels through the hardware cloth supporting the heating pad>
I have it blocked on the side under the largest dowel. That is there to keep them from trying to squeeze into that crease. I have two small boards blocking that you cannot see.
The dowels under the pad hold it up. The ones on top hold it down. I run that one at a little angle to hold the "flap" down.
Here is the flap, as you can see it is just hanging there even the smallest bird could push through it and not get stuck,
I cover it with disposable adult bed pads. The dowels hold the pads down so they do not slide around.
I am sure some of you will see something "dangerous" but so far it is working. I did have one crawl on top the pad and under the pad on the flap end, But I could not see how he could get hurt there, so I just snapped his picture and watched him.. The nice thing is I can raise and lower it with no problems, I am going to make a larger cage and do the same MHP system in it. Disposable pads are fast and easy to change and clean the pen.
Here are a couple under the pad.
And here is a box of Creamettes, I took the picture during diaper changing time..
I will do anything to show off my babies!!!