I have been very fortunate in my dealings with Derrick, as in the past year or so I have acquired from him a New Yost, a Noiseless portable, a Fox 24 and a Hammond 2, all presented in fantastic condition.
Derrick had offered this Corona on eBay at a starting price of $375 and when some smart Aleck offered him $75 for it he was so disgusted he withdrew it from sale. It's mine now, thanks Aleck.
It looks magnificent, but I fear it must have received a bump in transit. The pullcord had come away from the mainspring and was wrapped around the base of the mainspring. The mainspring no longer functions, as the spring inside the drum clicks over and doesn't "catch", so it can't be wound tight.
Any help would be greatly appreciated. As I think you will agree, this typewriter is far too beautiful not to use: