Regulator pointer on balance question.

Hello all, sorry for another post but I purchased my first Omega watch and I’ve been trying to figure out a repair regarding the balance. I’ve been trying to search the web but unfortunately not too much luck.

The Regulator Pointer part is missing, so the ring (marked with a red arrow on attached photo) moves freely since there isn’t anything holding it tightly. Surprisingly though, the watch runs well on the wrist and keeps good time.

That said, would purchasing a Regulating Pointer be a possible solution? I’m new to watchmaking so not sure if the Regulator Pointer will just pop on top of the balance and fit perfectly. The movement cal. is 601.

Thanks in advance.

Thank you!

Would eBay be the best place to look out for these parts?

If the watch runs well, would you say adding those two parts is necessary?
Curious what you would do under these circumstances. And again, really appreciate your help.