Mirage M1 grille cloth removal?

Hoping somebody has an insight into what might sound like a complete newbie question... how the heck does the grille cloth come off the Mirage M1?

I've got what sounds like a damaged midrange in one speaker that needs repair (and might be tempted to do a full refreshing while in there), but the first step is getting underneath her skirt. Can't seem to find anything online. Anybody have any advice?

Thanks in advance!