well here is what the insides look like....
http://3rotor.dns2go.com/images/r&d/...04459.JPG.html
the block normaly has a copper top....
gives me the ability to take pictures like these.......
http://3rotor.dns2go.com/images/Proj...05123.JPG.html
here is what they look like in action
http://3rotor.dns2go.com/images/Proj...05111.JPG.html