I never thought this would work, but my wife tried it while I was at work and so far so good. After finding my 18 month old sitting in front of my speaker with a slightly dented in tweeter and the grill on the floor, I knew I needed to do something besides discipline and re-directing her. Thank goodness the duct tape trick worked and pulled out the dome with with no problem. It still sounds great. Truth be told, I couldn't notice a difference anyway, but it bugged the heck out of me.
We took some thin but strong double sided foam tape. Similar to the stuff for adhering window visors on cars, only white. About 1-2mm thick and about 1/2 inch wide. She Placed 1 inch strips in 6 spots on the outer edge of the speakers. Top and bottom corners and on the sides halfway up. Then simply placed the grills on. No, the grill posts do not snap into place like they used to, but they still go in far enough to be stable. The grill frame couldn't be grabbed by the entire piece of the tape, but it's still pretty strong, even with the limited contact patch. The gap between the grill's edge and speaker is only about 1-2mm (the thincknes of the tape) and can't be noticed unless you're a couple of inches away and looking for it. Now, my daughter can't get her fingers in there and cannot (so far) pull them off, at least not before I catch and re-direct or she loses interest. To add a finishing touch, I colored the edge of the tape with black marker to make sure you can't see it.
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