If I had sold you the balancer, I wouldn't refund your money knowing that you had driven the balancer on instead of pulling it on with a bolt. I had mentioned this in another thread on balancers. You need to drill and thread the crankshaft with a 7/16-20 tap in a hole one inch deep. Get the bolt kit from Summit Racing or whoever, it comes with a heavy washer thick enough not to bend under load.
As far as undoing the damage or returning the balancer, I don't know what to tell you.
