Pistons and editing monsters

[Nuclearbones]

Hello again,

This time I come to you people for advice on elevators. For one thing, how do I get a piston running and how do I turn an object into an entity? That's all I need to know really. I got everything else covered (Thank you Rapture!). I would be grateful to know.

Oh, and also I want to know how to edit the Servant Grunt so that rainbow trails come out of his hands and so that it plays different music. That would also be very helpful.

Thank you all