here's a thing to try;

Blow out the end of a 25 hvy tube, leave some meat on the nipple at the end.

Punty up to the nipple.

part off so you are left with a 40mm long piece of the tube on your punty.

pick out the tube end so you can open it up.

with the right heat and spinning axis you can flip it out. I'm no expert but that's basically how I do it.

PS lemme know if you wanna score some pics of yer Sis.


j/k