DIY Vacuum Bell alternative request

Hey everyone I am looking for a vacuum bell "DIY" for growing my glands.
I have used the largest which is 42mm I think and I cannot find anything bigger
That I need due to my glands out-growing my largest vacuum bell.
So I need a "DIY" vacuum bell that I can build for a bigger size as I progress.
At the moment, I am stuck and cannot go past my limit using the 42mm which is to small.

Hope anyone can offer some suggestions for me.

A link to what I am talking about for reference.
https://www.ali express.us/item … o2usa4itemAdapt

Looks like a good bet might be the top end of a plastic bottle. Search your local stores for one the right size in decent plastic. Cut of the top, use a heated knife to bend over the sharp edge and optionally reduce the diameter with heat. There’s normally a rim below the cap that you can attach things to and you might want to avoid bottles without that or without a screw on cap.

Thanks for the advice will give this a try.