I certainly don't want to come across as argumentative, but I'd <span style="text-decoration: underline">urgently</span> advise anyone considering a Professional Products balancer to read
this thread from the Chevelle site. Note post # 14. (This is far from an isolated incident btw)
Good originals turn up on eBay now & then. If you don't mind an aftermarket balancer, I use, sell, and recommend Powerbond balancers as a good budget friendly alternative.