Check out http://sleevedwashers.com
it's what you think it is - a nylon washer with a sleev on it that goes on your tuning rods. It really doe what it claims - prevents detuning or "backing" out and makes tuning smoother. I noticed it immdiately when tuning the drum back after installing. I prevents metal-to-metal contact and ring, and for me , the biggest gain was not having to tune every single show or session. I hit pretty hard so this was a real timesaver. I picked up a bag of 100 of them for $24 in NYC (Steve Maxwell). They come in many colors, if you want to accent you drums. I went with clear/white.
It's money well spent.