I have magnet hooks that I put at the top of the back leg facing inside up against the top of the undercab. Quick, easy and convenient to get to. Plus you can't lose them or get them mixed up with other machines that way. Here's a link to the ones I have.
http://www.amazon.com/Learning-Resources-Magnetic-Hooks-LER2698/dp/B001G52NMQ/ref=sr_1_3
Check this one out. He's pretty cool. Head looks like a blackpinball too. Not sure how well the magnet holds though.
http://www.amazon.com/Pete-Strong-Magnetic-Holder-Magnet/dp/B00461LVI4/ref=sr_1_15