hey, i was going to mention something along the fast screw line.
problem with manual labor, which i do enjoy from time to time, my lady complaint that my hands became to rough, which isn't about my waza per say.
i tell ya that picking rocks to clear a field could produce tough fingers and other stuffs.
as far as dealing with finger grabs, i'd use the curve finger approach that rock climber use, might buy you a moment or two.
Any manual labour will make the hands rough and tough, there is always Nivea or Vaseline to stop them chaffing
Fishermen pee on their hands to stop the skin blistering, we used to do that to our feet in preparation before going on long forced marches in basic training RN, it works, I don't know how, but it does.... can't see anyone doing that on this forum......