This is the 3rd time I see this in the lids of Copco cast iron. Any insights to what this might be? Zink to prevent rust forming is the only thing I can think of.
I have a question - typebar electrics made by IBM are to me interesting. Especially the Executive with proportional spacing. So here are my questions:
1: is a model D significantly better than model C
2: model C uses a rubber roller that activates plastic parts to accelerate the individual type bars - I always question "plastic" - polymer or what ever composition - as in understanding the workings of the model C it highly relies on plastic parts to type - how good/bad are these parts?
3: the C relies on a power roller with rubber softer than your normal platen - have anyone come up with substitutions or is it a rubber replacement every few years (J J Short services in the US - I'm in Europe)
4: Are there any other well known failure points on the model C?
5: We are not talking price here. (Which is not a question - just context)
So I hope someone using this beast or having worked on these will chime in with honest opinions. My question is based on my interest in finding a couple electric machines - but the IBM Executive models are indeedh intriguing - maybe even more than a Selectric (and I have experience with correcting Selectrics) Shoot your honest thoughts. Thanks!