I received a VE-500 today that I bought from ebay. I bought it from the original owner (at least I hope that I did). To my dismay. after I tune the bass I can hear buzzing from the headstock when playing certain notes! For example, playing B on the G-string makes the headstock ring. It sounds like the noise is coming from the part of the machine heads that hold the stings in place. I don't know what to do. I spent $560 on this thing and I want this to be an easy fix. I bought the thing used because of the savings over retail price. If I have to take it to a shop they'll probably charge me at least $100 to look at. Help me! Any ideas?