Shane, yep, make sure its tight enough so you need expand it fit on and to role it into grove, make sure its profile isn't too high to prevent twist lock fitting back in place.
The small worn ridge should fit up against the O ring and the twist lock fitted back in place compresses tangs and it shouldn't slip anymore.
Tried mine tonight (NP boom)and it looks a good thing.

Just need to ride test it later.
Thought more on this since last night, thinking that maybe a larger O ring (in cross sectional dia) may work just as well, as long as it was held in compression by twist lock and boom end sat up against it as it sat in its grove, instead of the ridge on the tangs.
Fitted one, and it looked OK but will need to be test run. Just another thought some may want to try.
Mineral