An aquaintence of mine has a three string bass he picked up at some resale shop years ago (apparently). It is hard to assess the condition because this guys kid painted it with craft paint - kind of psychedelic. I am sorry I can't post pictures, but they would probably make you guys cry, anyway. I can probably talk it out of the guy, who has gotten sick of it. My questions are - 1. Are all 3 string basses 19th century? 2. Are they all worth restoring, i.e., are there cheapies that were not worth much when they were built that are still worth little? 3. Do conversions to 4 string involve major reconstruction? Can you add a new nut, tuner, and bridge and be ready to go?