Knobs: which one? I have some like the one on the right you can have. Are these half flat shafts or? If the left one is it, try sending a PM to Mike Koste of Gobs of Knobs, along with pic. His handle on VK is ekimetsok. Might have one.
http://www.videokarma.org/member.php?u=3886
BTW, I'll have a Guinness, please.