Actually, some fishing line ould hold it down (usually on the bottom, but I'd put it on the top) & the quarters would make sparks!
I also just ordered a tomy NSX, and 2 3.5 motors from bitmod1.com, so the dual engine project's a go!
I'm hopin' for some mind-boggling torque with a single cell (I don't wanna modify my charger). Wish me luck!