I was experimenting some today and found out that the Grande Trompo weight ring fits the outside of a Sidewinder in replacement of the rubber O-ring. Not that much more weight than if you did a solder ring though. I found some solder today at Home Depot on clearance for $4.00. Nice deal. But I would have liked to have found out sooner that a Grande Trompo weight ring fits on a Sidewinder. You can get a weight ring for $0.25 cents. If you look at the original Sidewinder it use to have a metal ring. The metal ring was changed to a rubber O-ring to better cushion impacts I think...But the rubber O-ring somewhat changed the play of the Sidewinder. I'll probably put a couple of wraps of electrical tape over the metal weight ring to help cushion the Sidewinder better.