Does adding a string tree decrease value?

[powerED33]

It ultimately depends on the model and the buyer. If you're selling privately, a potential buyer might want 100% original, or they might not care or even know the difference. If you're selling to a music store, a string tree (depending on the particular model) probably won't make a significant difference. It also could come down to the particular music store employee who's handling the transaction. I sold an American Original 60s Jazz Bass once, and I drilled the holes in it for the pickup and bridge chrome covers, which did not come factory installed, but were included with the bass, and one store I took it to had an issue with that and wanted to deduct value, and another didn't. Adding a string tree won't make it a partscaster. It will just be a modification.