I've had excellent results w/ the EDU Ultra 100 in Mic-X full strength by the way rjbuzzclick. Rodinal is nice too, but the Mic-X full strength is the bomb.
A bottle opener perhaps.
The ones this side of pond remove easy with nails from first three fingers, maybe yours (cassettes) are different.
I have noted a variation in the effort from one to another, normally my thumb nail can get a grip on one of the serration and push straight up.
Would a "church key" work? While it probably would distort the container, at least you might could get it open.....Regards!
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