Dwain,glad you came to visit. Please stick around and join in.We really don't bite.A luthier is always welcome. I'm glad you explained more about the flexi-frets. As I stated earlier I had a 6 1/2 (not a 7 1/2. Had to get the bugger out and count 'em) added, but I'm not to sure about the extra grooves in the finger-board.
However, the concept of adding the extra frets in a short time to play different tunes is intriguing. I would have to see the system already installed on a dulcimer to really form an opinion.
Yes,Bert, I know. If I didn't want grooves, I would have a fretless dulcimer.
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