I have an M & P Shield and have found that I need to enhance my purchase on the grip. I have opted to use an inner tube rather than Talon Grips, Decal Grips, or similar products from companies like Pachmayr. I am having difficulty in finding the proper size tube. In the past I have used mountain bike tubes for double stack grips, but they are too big for the single stack grip. Has any other forum member found one that fits snuggly?