This is my first time doing something like this, so here goes. this is a 1x2 blue brick, worn from being in my bins with holes on each end:
Through a hole, you get this view of what you see in this bad picture, of the center peg and the light coming in through the other hole.
Here from the bottom there is the peg, the holes on the sides, and the "pend" from pat pend (pat is above, but unable to be seen).
finally, I have done a lot of research and found a grand total of nothing about it, so I tried some stuff out and learned that the only thing that fits in the holes are minifigure arms and so speculated about a 4 arm guy.
here are my tries at fitting other stuff.
Thanks for looking and sorry for so many pics! -Erich Wacker