Simple Tool To Help Stroke Survivors

I Was working with one of my clients this week, who is recovering from a stroke. One of his challenges/goals is to get better control of his affected hand...he says he has no nerve 'feed-back' (sensations) to tell how hard (or easy) he is squeezing his fingers.
I took a sip from my water bottle, while thinking for a moment...then sat the water bottle in front of him.
"Pick it up" I said...and as he did, the bottle made that loud crackling sound they do when squeezed half-full.
"Did you hear that?" I asked...
He said "yes".
"Okay, try picking it up again, listen for the noise, and try to pick it up with less crackling."
He picked it up again without as much 'crackling'.
"Okay, try it again...work on even less crackling"
He did, and this time without ANY crackling.
"NOW do it with MORE crackling.."
And he did.
I told him "NOW you have a 'feed-back meter' (your ears) to practice your grips.
He grinned SO BIG...and simply said "cool"!!
So, there's a cheap, effective tool, (that came to me 'out of the blue' just as I needed it), that now YOU can share with anyone you know, who may be dealing with that same challenge!