Those small barbs are often press-fit. Check with a Mercury dealer using your serial number for the exact part. Online marine parts sites like Crowley Marine or a salvage yard might also have it.
That's the classic fisherman's field repair right there. Superglue and turmeric sounds way better than an ER bill. Hope the foot heals up fast, and the good fish start biting next time.
Welcome back! For a rock-solid spinner with zero wobble, you can't go wrong with a Shimano Sedona or a Daiwa Regal. They're both fantastic value and will feel great on your Ugly Stik.