iron hand help please

[Peter]

hello everyone, my name is peter. for 4 years now i have trained in iron hand. however, there is one feat i can not seem to grasp. how to drive nails with the palm. i have seen it done but can not grasp the tecnique. does anyone know how to do this ?

[Neil-o-Mac]

Here's a hint...

http://www.tool-up.co.uk/tooldev/images/items/24493.jpg
Try using one of these.