Looking around the shop, I found a couple clamps off of a late model Sportster. They were a little wider than the V-Twin clamps and made of stainless steel, so they seemed like a good upgrade.
I slipped one over the exhaust pipe and tightened it down. Still not tight enough. To reduce the diameter of the clamp, I removed the center spacer, by first driving the bolt off of the clamp.
Once the spacer was removed, I reassembled the clamp and gave it another try.
This time when I snugged it down it was tight enough to hold the muffler firmly in place. I rotated the clamp so that the bolt was on the backside of the muffler, keeping it out of the sight of the casual observer.
