After seeing the title of this thread and reading the first post it reminded me of a problem that I had with my Canon EOS battery holder/grip. It turns out that they used a type of clearcoating to give the grips a matt finish and over time it has degraded and become sticky. I went to my closet and pulled out my Vader FX Saber and found that the grips were exhibiting the same problem.
The problem with pulling the grips and replacing them with what's out there is not really the notch cut for the battery cover but that the curvature on the FX saber is wider and deeper so they replacements will stand off further... probably more like the originals but not like the FX saber.
I was able to clean off the sticky clearcoat from my camera battery cover by using alcohol and one of those
Mr. Clean Magic Erasers. I figured I'd try the same method on the saber grips.
It worked quite well... although it will leave very slight scratches on the plastic of the grips. The Magic Erasers are essentially very mildly abrasive. I guess if you wanted to you could mask the grips and give them a coat of
Plasti Dip spray.
Here's quick photo showing the difference. The sticky one on the left and the cleaned grip on the right. It's hard to see due to the black grips but the cleaned one is smooth with no sticky residue.
DISCLAIMER: As I mentioned, the eraser sponges ARE abrasive. Use them at your own risk. I detected no damage to the chrome on mine. The cloudiness on the chrome you see in the picture is from the alcohol drying.
http://propaholics.wolfchasers.com/uploader/users/public/w41162photo 3-1f103.jpg