Slowing down a bug with a round pendulum is easy! I small piece of brass tube and rod, and you're ready to QRS! The flat-bar pendulum models are a bit tougher to extend. I've been designing and printing variations of this design all summer and I've finally got an extender that fits the Vibroplex Lightning bug, Champion, Zephyr, and J-36. This video demonstrates the basic functions. I look forward to your feedback. I highly encourage everyone to experiment and create their you're also more than welcome to purchase one of mine from eBay: My eBay listing for FLAT-pendulum extensions (this video): For round pendulum models, see my other video: and the eBay listing for ROUND-pendulum extensions: The eBay listing for the SWAG kit (color matched knobs and paddle):