How to strengthen left hand

I have been having problems with a weak left hand. My whole left arm is weak due to a previous injury/nerve damage, and that includes the left hand.
I found this finger exerciser on Amazon, and have been using it for a while to strengthen my fingers, especially the pinky finger, which I struggled to apply any pressure.
It’s cheap and basic, but it has helped I feel.
Might be useful for others.

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