For any future readers, just click the link above and you won't have to search for it! I just love links!
Anyway, as far as I can see the otherwise excellent walk through doesn't contain a description of the correction of the mainspring, but if @jdmwants to tell us a bit more about it or have something to add I'd be an ardent reader!
I Googled "EB 8201" (site:watchrepairtalk.com EB 2801) but nothing came up. Can you please provide a link? I don't even know what an "EB 8201" is.
And while on the topic of links; as a service to my fellow members, I always try to include a link when I make a reference to something I've read or created on the WRT or elsewhere so that they don't have to spend their precious time on trying to find something that cost me so little to provide. And, it makes me feel good!
I must say, that's sounds like a pretty interesting idea. I will definitely try it. Thanks! Unfortunately, that will make me click a "buy button" or two as I'll be needing a spirit lamp and some methanol. I guess my "good repairer/watchmaker" score will take a hit, but if I can get that GR spring to work in my Orient it'll be worth it .