Thank you for the suggestion, I will try calling him.
The string holes have gradually gotten larger, causing the angle at which the string crosses the zero fret to change in such a way that the zero fret breaks the strings quickly. I can extend string life by wedging tiny pieces of Kleenex between the string holes and the zero fret. I shipped the guitar back to Roscoe years ago and he said that there was nothing that he could do about the string holes. He did upgrade the electronics and the tubular frame pieces and replaced the frets for me, which was much appreciated!
The main issue that I have is that the thick neck causes wrist pain and weakness behind the thumb and makes the instrument harder to fret. I asked Roscoe if he could somehow (maybe by sanding?) make the neck thinner. He was not interested. I can understand his lack of interest in trying this type of modification because he has had a long and distinguished career pioneering the Soloette, and he is about ready to retire.
I had pretty much decided to just live with it the way it is until about 2 weeks ago when I met a retired Navy guitarist who had the same hand problem that I have. His problem was so severe that he that he was actually scheduled to have surgery! The surgeon was sick on the day of surgery, so instead of having surgery, he bought a new guitar and quit playing the Soloette. A month later, his hand problem was gone! So he sold the Soloette. He tried playing my Soloette and started experiencing the same thumb pain in less than 5 minutes.
I play the Soloette way more than any other guitar at home because the body shape is superior ergonomically for me, and because the quietness makes it good for family life. So, after hearing that at least one other person had this problem, I decided to pursue the possibility of thinning the neck. My local guitar repair guy, who is very good, is not interested.