Whilst instructing from Belfast in 74 I had a student who was a farmer with the biggest hands I'd seen on a human being.
Trying to teach powered descents I demo'ed various rates at various speeds, on trying to emulate them himself it was evident that the sheer size of his hands were not going to permit fine tuning.
When, out of frustration I finally asked him to demonstrate a speed and rate of descent of his choosing his reply was ...................'Sure I think we're going down fast enough!'
You can't argue with Irish logic!