I have an older pre-war Smith & Wesson that has the hard rubber grips. The left grip panel has a crack starting at the butt end. Right now the crack is very small although you can feel it with your fingernail. I am worried that it will get worse. What is the best thing to do? Just leave it alone or maybe put some kind of glue in the crack to keep it from getting worse? I like to shoot the gun with the original grips on it but I fear that if I continue to that the crack will get much worse or even break away completely.