Single-ball string adapter for Steinberger Spirit

thingiverse

With strings installed: https://youtu.be/uKsCDRRQzng This is a prototype single-ball adapter designed specifically for the Steinberger Spirit. I've used it to install Ernie Ball Beefy Slinky strings in A# standard, which typically requires double-balled specialist strings that are difficult to find and expensive, not to mention unavailable in unusual gauges. Screws are needed (I'm unsure of the size, but spares from previous projects will work). The initial prototype exceeded my expectations by staying in tune, but its long-term stability remains uncertain. I wouldn't be surprised if the thin walls and self-tapping screws cause a crack over time. Installing the low A# string was challenging due to limited space in the tube. This adapter is designed to fit snugly into the truss rod/screw holes on the headstock stump, securing it with string tension. Once both strings are in place, it remains stationary. Screws are required to clamp down onto the strings within the adapter, preventing them from sliding out under tension. I based this design on a traditional single-ball adapter like the one shown here: https://www.talkbass.com/attachments/img_0767-jpg.73406/ For optimal results, print it out of PLA and make it bioactive as described in this video: https://www.youtube.com/watch?v=IUN7ZdsRAGQ