What are the two types of Manual Typewriter?
Why is this question in Maintenance Repairs? There are homemade wire stripers made for this purpose but you will have to look elswhere for them. Burning the plastic off will contaminate the copper, so there is other ways of doing it.
As printers age, the rubber rollers that move the paper dry out. This causes them to lose their grip on the paper. Sometimes lightly sanding the rollers with fine emery cloth can improve their pick up.
go at search of site type radioactivity .You get hints.Choose the appropriate one .