Thanks for writing POPPAGATOR. Yes, I remember Koerner, Ray and Glover (first heard them on a 'sampler' album I was given highlighting sixties performers)I didn't know he played a seven string, they did some rousing blues.

I can't remember for sure, but I seem to recall that all the strings on this teacher's instrument were separate- but perhaps my memory is hazy- likely we'll find out- I am often in need of completion or correction too ;-)