There is another technique of cupping the fingers together as one which does not use the thumb as an opposing unit, but as part of the other four fingers.
It is not often used in early stages of training, or by many Aikido teachers, but it is another method of restraint, guiding, and very effective.
Either that, or improve your hand strength until you can make a letter "C" with vise like precision that is tight enough to not slip past the hand, but doesn't cut off the circulation. That would be the "gorilla arm" technique.
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