^I wasn't planning on it- I'm already over budget. :-( I've got the real ones all banged up for my photos and will probably just go without if there is an issue at a con. You can't really see the scale, but it is a little bitty hammer that doesn't pull the belt down too much. A real piston, however, would be WAY too heavy, and will be made of foam. Foam shield, too.
I'm way too excited about getting the arm finished, so hopefully I'll be able to show how the bondo texture worked in a week or two.