Ok, I'm glad John, for your acquisition station, TKS Jim for sharing your technique, I use a variation of uses way to send only keep the index on the knob getting the thumb and middle of the disc, the others are free, today, for the SKCC SKS event I could operate continuously for 2 hours, at the end I felt some discomfort, especially on the middle finger, because the space is small and the fingertip is pressing the edge of the disc that is fine .. well, I'll try a variation technique and will not work , I make a disk a little bigger, I do not want to replace the knob

... but... I have several other keys but I enjoy using very straight keys (SK)

, TNX HPE CUAGN - BEST 73.
Nat PS7HD
SKCC#8094T