To answer your questions:
- Yes it will because it gives your thumb more room.
- No, the Big Ben does not have weight rings and thus there is nothing inside to fall out. Anyway, they wouldn’t fall out that easily.
- The caps have a minuscule weight and thus it will not affect it much (at least you can’t tell the difference)
- Yes. If you don’t destroy them by taking them out. You can just press them back in.
To take them out, I would recommend using a suction cup or a piece of duct tape and pull slightly at an angle not straight up. This will make the suction cup/ tape stay onto the cap for you to remove it.
Have fun thumb grinding!