Response to Stainless steel roll film tanks

I think the problem is caused by the cap being airtight and there being little air in the tank when it's full of liquid. You have to let some air in to remove the cap. I have a flat little plastic gizmo that I got from new socks or a new tie that I use to pry up on the cap with. It breaks the seal and the cap comes off easily. I've though of drilling a small hole in the cap to let air in and cover it with my finger when agitating but never got around to it.

Cheers,

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