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It works like the day it came out of the factory now!
Mainspring assembly laying on my bed:Back of typewriter without the mainspring and escapement:
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By the way, make sure you have ribbon spools in the machine when you are testing it! I'm not sure if the same applies to this machine, but I have a '50s Smith-Corona standard that was having mainspring troubles until I realized the mainspring wouldn't turn one way unless I had spools in the machine! I'm thinking it had something to do with the mainspring powering the ribbon advancement, but I can't be sure.
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it was a common problem on older machines, and there was many a time I have had to take the main spring out of its housing to degrease it, when I was servicing machines back in the 70's and 80's