I am converting one of my blackhawks to a bisley grip frame. I have an in the white new bisley grip frame. I installed it, and it needs considerable fitting. I was expecting this. My question is what is the best way to remove material? I marked it up so I know where the material needs to be removed. I know that a series of files would do the job, but is there a better way? Maybe a belt sander? If so what grit would you use? This is going to be my first attempt at this, so any and all information is appreciated. Thanks in advance!