Backun musical services has been well known to clarinetists for sereval years.
Morrie Backun, the owner, is not head of clarinet design for Conn-Selmer (and Leblanc) instruments, having designed the new LeBlanc Cadenza clarinet.
I tried a couple Cadenzas while at the LeBlanc Factory in Kenosha, WI, ultimately selecting the slightly more expensive Concerto II model. However, I enjoyed how the specially designed ringless Backun barrel, made of cocobolo wood, sounded on my concerto II, and so I ordered one of the barrels from the Backun web site.
I got a great sounding barrel and the folks at Backun music were great to deal with. Backun also supplies bells and mouthpieces and are a clarinet player's dream.
I recommend them highly.
Here is their web site: