Mending chinstrap loops on a Gallic G

[Crispianus]

Hopefully the pictures will turn up, but there really isn't much to show - the attachment has come away from the rivet, because the rivet has hardly splayed at all. I assume I have to get rid of the rivet, but it is still tight, so how to do that without damaging the decorative stud on the outside I don't know - pincers? I also need replacement rivets, but I've never done riveting before; happy to give it a go, but don't want to write the helmet off in the process.  From the way this is made, I'm guessing it's a rather common problem

Unfortunatly you'd likely have to drill the rivet out, this is probably best done on the outside and would need to be carefully done so as not to damage the decorative washer, remove the cheek piece from the helmet, center punch the very center accuratly of the rivet and drill with a drill the size of the rivet shank to the depth of the rivet head it should then come away leaving the decoratve washer free to remove, punch out the remains of the rivet with a suitable punch..... after this replace the parts with a new rivet, you may need to clear the holes with a suitable drill, cut rivet to length 3mm extra should be enough and peen it over on the inside, you'll need something solid to rest the rivet head on to act as a reaction block.. good luck