For those wanting a user friendly guitarron for jobs that plays like a 4-string... I have a converted guitarron made into a 4-string. Learning the legit technique and playing octaves on a bass tuned A to A is too involved for me. The conversion only requires a new nut cut for 4-string spacing. For strings you can use an existing guitarron set. Install only the lower 4 strings of a typical guitarron set spacing the strings in the bridge holes as best you can, tune the low A string down to E, the D string down to A, the G string down to D, and the guitarron nylon C string tunes down to G, and then cut the new nut for these strings. The reason you can use a regular guitarron set is because a typical set has pretty high tension compared to electric bass. Regular electric bass strings sound like a## on a guitarron. My converted guitarron sounds great and I use it professionally for recording and Latin/Mariachi/Ranchera projects. Still sounds closely like a guitarron, and not one complaint about sounding authentic or the visual. I've had custom guitarron low E strings made for my bass but found I didn't really need to do that because 'bumping' a typical guitarron set works and plays just as well. Just buy a set of La Bella guitarron strings and convert your bass if you need to.