Hi @casouw
You could try clearing the case of all its components and then creating some sort of formwork (pieces of scrap plastic perhaps?) either side of the broken section so that you can fill the gap using epoxy resin. Overfill a bit so that it can be sanded back and gently remove the formwork whilst the epoxy is still a bit tacky so that it isn't attached to it anymore
Once it has fully cured (read the product label for info on this) you could then sand it back for a smooth finish. Maybe only the top and outside, it depends on what is attached on the inside of the hole whether it needs to be that smooth, flat etc or not on the inside.
Then drill an appropriate size hole in the correct place, (use a drill bit to measure the hole in the good earpiece cover so that you get the correct size i.e. one that is a snug fit in the hole)
Here's a guide that explains about epoxy resins that may help.
Just what I'd try.
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@casouw add a couple of pictures of the part that goes into that hole.
crwdns2934271:0crwdnd2934271:0 oldturkey03 crwdne2934271:0
@oldturkey03 thank you for the advice I will do that when I have the time to do so
crwdns2934271:0crwdnd2934271:0 Cas crwdne2934271:0