This has been the killer for me on JK horns...I have some elbow and shoulder issues, and I'm surprised at how much the offset lower stack helps on all horns. Most of my remaining JK horns have relocated/replaced thumb hooks and some epoxy buildups, but it's still not as good as the Yamahas and Yanis. Love the sound still, though...stevesklar said:FYI,
The selmers etc have offset stack keys. The RH stack is offset towards the hand.
THe JK has straight stacks. the RH is not offset and are in a line to the top stack