M: Place your right index knuckle onto the flat palm of your left hand then twist.
H: Place your hands under the person's hands. Then do the manual sign of placing your right index finger onto the flat palm of your left hand twisting your knuckle on it at the same time.
C: Place the person's right index knuckle onto their left flat palm, twist their left palm on their left palm.
B: Place your right index knuckle onto the palm of the person's hand then twist.
O: Use some real keys.
TC: Old keys can be glued or stuck on with velcro on a piece of card.