Old or new model? I struggled hard with them for about a month with a pair I had that started wobbling after 8 routes, and I think they only caved because I worked in an outdoor shop at the time and they sent me a new pair.
The updated version is supposed to have the plastic insert that stops the head from wobbling so you may have more luck with that but my (and others) experience with Lyon and their warranty handling is not good.
Done right it's a proper fix, I've got one that's going strong 3 or 4 seasons after the fix. However, if you're going down that route better to do it sooner rather than later. I did a mates a few weeks back and it was a more difficult and less satisfactory fix because of the damage to the top of the shaft.
Edit: If you're going for it PM me and I'll send you some rivets, I ended up with a big box of them!
Out of interest what size rivet did you use? The other options I've seen with the screw in bolts slightly worry me as you need to drill out the hole to a much larger diameter - have you managed to do it with less drilling out with these?
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