hello out there-- i recently had a very talented luthier make some amazing repairs/adjustments and do an overall set up on my acoustic bass guitar. the bass plays great. the action is about as low as you could ever want it. the A & D string buzz when played open. the E & G are fine. the luthier cut me a small strip of wood (ebony) and said to place it under the saddle the next time i change the strings--in order to slightly raise the action? does this make sense to anyone out there? if so, any particular way to do this? i am a skilled tradesman (experience working on guitars and basses) and my luthier thought enough of me to assume i could handle the modification. any suggestions before i attempt this? my grandpa taught me to ask before i do things for the first time. thanks dudes 