Can you buy new tubes for mercury carb balancers? This is the second balancer I have had the tubes shatter on. Getting quite a stockpile of mercury at home. I thought the tubes might have been made of glass, but are actually plastic. It is a Motion Pro balancer- they made two models- one with yellow plastic tube holder, and on with a white metal ruler style backing- mine is the white one. It seems that they don't make them any more- no mention on their website of the device or spares for it.