Hi String......I'm Catspaw, known better as just Spaw.......
Basically they've been around for years. Some with two strings and some with only one. The idea was simple.....a fun instrument that was affordable to make and in the mountains, that was something! Your REAL dulcimer may have been on the mantle or some other safe place, but this thing was a simple stick!
Here's a photo of a one stringer and its pretty representative of what they are all like. You can use real machine tuners or cheap ones or eyescrews like I describe. Part of the fun for me was making them really simply and less costly.