Your machine went out today
The sheet metal parts (and PEM) for your S3 were made by a different vendor than we’re using now. In fact, we ditched the old vendor about 1 batch into shipping the machine last year - his quality wasn’t up to our standard, and a lot of the PEM nuts he delivered had to be repressed here in our shop.
We’ve never had a problem with the PEMs from our new vendor.
The other thing is that because the parts are pre-assembled - the PEMs will be shipped in tension (with locktite) so the chances of something coming loose are pretty slim. I think you’ll be pleasantly surprised with what you’re getting.