Hi all, I am trying to sort out my latest build, a 21" scale ubass. I used Thundergut strings, but they don't seem right. The lower strings are very slack, I can't seem to raise the strings enough to get them to stop buzzing on the frets. The higher strings seem quite taunt but still buzz. Can someone share a proper nut and bridge height for these strings? I found a reference to a 5mm height at the 12 fret but how do I balance that at each end?
I'd try filing the frets just a little at a time with a fine file to get rid of the buzzing. It seems to work most of the time.