Here's the question..... I have a '71 Precision. When I bought it the neck had been replaced (Boogie Bodies). Since then I've added an active EMG pickup. That required some routing for the preamp and battery. I'm getting ready to refinish and refret. This bass is part of a growing armada of basses that get weekly use. As far as affecting the value of the bass on the vintage market, I couldn't care less. It was the 1st quality bass I ever bought and I won't part with it. The question is this.... When modifying a vintage instrument, at what point do begin to stray from the basic character of the bass?