In the cheap one, we have two perfectly flat brass pieces pressing against each other.

I’ll bet you any ammount you want, that’s not brass. It’s iron with brass coating.

There is no way, in this sub or any other. Lemmy still doesn’t support video upload. And even if it did, video takes so much space that the instance would have to recode it, which would take a lot of CPU/GPU power, so even video upload becomes a thing some day, I seriously doubt most instances will have it enabled by default. NSFW instances, maybe, but regular ones, probably not.

Russian forums like remont-aud.net. Or write on the forum, maybe someone has all of them and they can just reupload them.