I was saddened to hear about your struggles with the pain! I know only too well what you are going through. The state of Washington...
Before you start pulling out the high tech stuff, this is a Knabe WGS-54 made in 2011, right at the peak of Samick's QC issues.
The biggest problem...
Thanks Fred for your post. I'll do what I can with the stack, and hang new hammers this summer.
Then you throw in the 5mm string height difference between the mid tenor
and high treble, and it gets to be even more fun.