I have a friend many states away from me who has purchased an older Dan Wesson .357 that did not come with the barrel tool and gap gauge. He did not even know about the tools and complained that the blow by when shooting the gun is very noticable and in an email to him I explained that the barrel threads into the frame and a gap gauge is used to set the space. My .357 Wesson is packed away where I cannot get to it so I cannot measure my gauge to tell him the proper gap. Question: Using a feeler gauge what is the correct gap on the .357 Wesson and is there a source for the 2 piece barrel tool kit? Thanks...