IIHO always remove the grilles by pulling in at least two places at once - pulling at one point solely may result in unexpected consequences.
Now that you know how to remove and replace the grilles, out of interest, when was the last time you re-torqued your speakers? Nice to have the cosmetics right; setup will bring sound rewards.
Well done! I still need to find the courage to fix it for my Ovators. A kid crashed against the Ovator and it’s why I bought Ovators: they have robust grills and weight 62 kilos each:-)
Thanks to @HungryHalibut you have an earlier thread.
The details are on the Ovator Top Level spec sheet, which can be requested.
Star pattern is how I do it, loosening each one slightly, then re-torquing. A torque screwdriver does not “measure” so it is necessary to loosen first, rather than just insert and twist; you may already know that.
Recent discussion with the excellent dealer Signals, with lots of experience with Ovators in the past, recommend also re-torquing the bases, as well as the drive units.
I believe one of their customers still runs active Ovators.
edit: Graham although I have active S600s, I must admit I have only done the bases on S400s, having recently acquired another pair, so I have not studied what is involved.
Each grill tends to be a little different, probably based on tolerances. I have more than one pair!
Some slip out without much effort, others less so. Important imho, to put them back exactly as removed - i.e. 12 back to 12 position wise.