I have no idea who this guy is, might even be a member here.
His channel is A.G. Engineering. It does not look like he has a lot of videos, but a few of them are A10 related. In one it looks like he bores a timing side bushing, in another he is trying to weld up some cases.
Then there is another guy called "Lunmad" (pretty sure thats the spelling) He completely rebuilds a triumph engine in his own small shop. Thats really interesting, you get to see how other people do things (even if you dont agree with all of them.)
I dont know how to become a subscriber, but I would support anyone making videos about bikes. Yes, before and after videos are great to watch, but I really enjoy watching other people do actual work while I sit on my butt and drink coffee.
Lee