I have a holster for a S&W 625 that is really close to fitting my GP-100. The barrel on the GP-100 was replaced to have that squared off look similar to the Performance Center 627. I no longer have a 625 and I'm willing to try to heat the holster and change the shape. My question is what do you use to press the kydex into the gun to get it to keep its shape? Is it worth trying? Thanks in advance.