just don't put he metal plate back, none of them. seriously.
they hold solid without these clamps, and as I said, it you ever fall on the side, they will just pop without breaking anything
AND I KNOW BY EXPERIENCE, I removed the plate before a later fall and no damage at all.
You may want to fill the opening of the stalk with silicone just to block water better, not that it was waterproof before, but the clamp did protect a bit. Don fill the blinker entirely though, it would interfere with turn signal bulb replacement.