I've been using the K&K straight rail pickups on my musser pro vibes, and i've been loving them! Recently one of the piezo discs cracked and came off, so I decided to splice my own cable/jack/piezo and make a home replacement. When I was done I glued the disc on (it's the "optimal" spot of the bar) and plugged in, but the replacement disc is MUCH louder than the rest of the bars. My guess is I need a specific size piezo to properly and evenly pick up the sound. I have no idea what kind of discs they use, and the only buying option on their website is to buy the emergency kit (which has a lot of stuff that I don't need, and it's $80.) Does anybody have any information on what kind of discs they use?