I'm going to start by saying that I fully understand that my question is likely a long shot, given that these basses are not all that common, and that the number of owners who actually de-tuned them to BEAD at any point in the game is even smaller...anyway... A couple of starting points and concerns: 1) I can't play flatwounds. Never could. Tried it time and time again over the past 35+ years, but they just don't work *for me*. Not a diss towards zillions of my fellow bass players who enjoy them worldwide, just a thought to bear in mind. 2) The bass is currently strung 50-115 in standard tuning, feels nice and very tight and I'm certain that I could drop down to C# without getting a "bow & arrow" effect, but that's not where I want to go. I'd like it to become a 5-stringer who left its G string in another lifetime... 3) Given the tuners (this is an early model with a slotted headstock) as well as the nut, I doubt that I'll be able to get away with anything thicker than 125, and even that might be a stretch, although probably a doable one. That's what I've got right now. Questions are welcomed, and suggestions appreciated.