How can I safely make hole sizes in cage items safe for gliders?
I have some items between 3-1”

Apparently, my reply didn't post in your other thread. Sorry.

Minimum 1/2" maximum 2.75" holes. They don't have to be round necessarily.

I use things like flat toys, or 1/2" by 1/2 " tenax, or safe plastic mesh. I've used a poker chip, cut a coffee can lid cut down, just about anything. I drill small holes in the toy and what ever I'm using to cover the hole and zip tie in place. Any glue or hot glue is not safe.

Thank you so much!

You're welcome!

I did forget to mention that zip ties must be flush and tight. The gap between zip tie and what it's attached to cannot have small gaps. We call it a toothpick test that we use. A toothpick when poked between should be a snug fit in that gap. Think of their nails. They can get trapped.

Also when you trim the zip tie, be sure it's as flush as you can get it. Take a lighter and burn it slightly to remove any rough edges. Their skin is very thin. toys should be checked for rough or sharp edges and filed off.

Batteries, wires, and screws that can rust also need to be removed. No hinged doors that tails could be trapped, pinched or de-gloved as well.