Power pads/leather strips on main strings on head of racket..?

I have already used pieces of leather like seen on the photo. On cheap Babolat rackets for a girl in my club to prevent string breakage or damage when starting the mains (she liked BG66 and holes and grommets weren't top quality on this frame, so I remembered I had a piece of tennis leather grip, I cut it and placed little pieces at 12 and 6 o'clock during the stringing process). It worked, no early breakage of the string due to the added protection of the leather, but it changed the balance of the racket, head-heavier than it was already. One piece of leather at the top and two at the bottom have noticeable weight, even if you cut them after the stringjob at the right shortest length. The other possible issue is string damage at the top due to risk of friction, kwowing the string goes beyond the frame in this area.
So if you need extra protection for thin gauge strings, it could help, but it changes the balance of the racket. So if you need to add weight to the head of the racket, homemade power pads like these could help, since they will stay in place (no glue and no adhesive tape needed).

EDIT : I did it for another racket at the bottom, because I didn't have the right length of U grommet for holes B1B2. Instead of using the optimal U grommet I used normal grommets and the little strip of leather, it was fine too, but still add weight to the frame ...

 

And if you want to learn something about the origins of power pads and what is the purpose of using them on tennis rackets, you can read this article : https://www.perfect-tennis.com/power-pads-for-tennis/