Does anyone have experience with altering or modifying kydex holsters? I have a couple of Fobus brand for different pistols and recently bought a Black Hawk Serpa holster for my Springfield XD, sub-comp. I like the Serpa security but with that and the others, the muzzle end is squared off, with a relatively large empty space with short barreled pistols. Kinda defeats the purpose of a short barreled pistol. That squared off area makes concealment difficult and I am tempted to try and remove some of the material at an angle, perhaps with a belt sander. Has anyone tried that, and if so, how did it turn out? What should I watch out for? I have and really like Blade Tech holsters with rounded edges on the muzzle end, but I can envision ruining my Serpa by applying heat and trying to mold it to fit the gun.