Being only three kits back into the hobby after decades off, I was wondering what others do to solve the problem of barrel droop. (I even had this problem in my teens)

Most kits come with the ability to articulate the barrel, but I find after a few side and up and down movements (to get the paint in those crannies), my barrel becomes rather limp. I've tried bracing across the supports inside with masking tape, but this only lasted temporarily and will not be appropriate if I want to display the interior.
I'd be grateful for any tips or tricks (other than a blue pill or a vacuum pump) to increase my weapons' staying power.

Regards, Lucien