First, this is one of the easier mods, with possibilities of having the largest impact, be it good or bad, depending on how well it is done and the rest of the handle.
First, choke up on the handle to see if the scales are comfortable for you. I considered this mod, but I found the front of the slabs (particularly the scallops) to be too rough to hold for extended use. So I opted for another mod on my PR.
If you do decide to proceed, grab a wooden dowel or other cylindrical object as you would a knife (maybe a beater kitchen knife?) and mark both sides of your pointer finger with a pencil, with about 1/16" clearance on each side.
Remove your hand, and measure this gap. Go to your local home improvement store and buy a sanding drum that closest matches this measurement. Make sure to get coarse and fine grit drums to match.
Chuck the drum in your drill and go slowly, while checking the edge for heat with a bare hand. Dunk in water to cool as needed.
- Worthy of note, some sandpapers and drums do not work well with water and will she'd their grit near instantaneously. If using water to cool your knife, dry it after you dunk it.
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My preferred fix for my PR was needed because I wear an XL width glove, and as I said earlier, I didn't want to hold onto the scallops up front.
I took the rear hump off of the handle, and rounded the corners of the slabs to soften the hand feel. It is one of my most comfortable knives now, and I still have a little tweaking to do.
Before:
Removed offending material, pencil line was factory:
Like I said, I still have a little more to do in regards to shaping the rear of the handle. Other mods planned are etch, strip, and polishing the tang and spine.
Edited to tag
einsteinjon