I wrapped the handle of mine with stick on Velcro (loops side) after cleaning the surface with alchohol. It's still stuck on good and makes a nice grip. Then I sewed a patch of the hook side velcro to the tab part of the holster. That holds the handle flat against the tab so that it's not as likely to snag on lines or other gear rubbing against it.
If you do this, leave a bare strip down the side of the handle where your fingertips will first want to slip under the edge. This makes it more likely that your fingertips will wrap under it, and not just slide across it...in a panic
when you insert the knife into the holster...do so in a way that puts the Tit...errr nipple...eeerr...sorry Toby!... the Protruberance at the end of the handle, under your pinky finger.
Hope this makes sense.