I found one last year at a swap meet. The seller was busy on his cell phone and I held up the muffler and a five dollar bill. He nodded yes, so I left with a bargain. The last one I saw on the auction site went for $52 and change!

I haven't given up, but I bought one of these old Dubro jobs which is better than nothing. It has a spring inside and you can adjust the tension to alter back pressure and noise level.

David