Take a rubber sensor gasket off an older gen Moto Droid Model. You can modify if you see fit. This is the best thing I have personally found that works as buying a replacement Moto X can be pricey as you will have much difficulty trying to find JUST the rubber gasket piece. Even if you purchase a moto droid Razr from a few years ago for $20 and jsut harvest the rubber gasket out it will work and save you $$$.