Rounded these pieces off, drilled a 3mm hole and attached to the main... thing with a 3mm shaft.
drilled tiny 1.7mm holes in the sides of them, tapped to M2 and put little screws in the hold them against the shaft. I will use M2 grub screws, I have ordered some.
parts for the thumb
the 2 fingers
quite hard to make these, they are slanted on 4 sides so had to hold them in the vice with the peg that they pivot on and then rotate the vice to get the angles.
drilled them through and checked movement
and the little thumb, same process, all drilled and taped. Had to counter sink the finger screw slightly to get the right look
now spend best part of half an hour using fine grit paper to rub the machining marks off the ally to achive that satin finish, so they look smooth.
I dont often blow my own trumpet, but im very proud of this picture and the likeness to the real thing