I saw instructions on how to make a messenger bag with a grommet and rivet making kit on this site while googling how to put rivets into a bag strap. My messenger bag is the type where the strap is a kevlar-type material with metal grommets and a belt buckle to adjust it. Unfortunately, even at the tightest setting I still feel like it keeps hitting me in the butt. I want to be able to strap it close to my back so that I can run while wearing it and not have it fly all over the place. Any suggestions in how to go about installing a grommet at a tighter setting?