[Hugh]

If you are just trying to fit them, it is trial and error. Try a panel and see where it needs wood removed, and then take a little off and try again, repeat until it fits. I use 4" & 6" coarse files from Brownells and Midway. Start at the top and examine the frame and grip panel closely to get a thorough understanding of how the grip fits into and onto the frame. You can compare the new grips to the originals to see where the new ones need to be altered.