Following on from the previous post, here is a video showing the disassembly of a Lettera 22. But, first things first: do not disassemble a typewriter unless you really need to!
Most of the time, common issues, such as a carriage that repeatedly slides to the left, a typewriter that skips when typing or a typewriter with sticky typebars, can be resolved with a general chemical clean. This involves using a solvent that is safe on plastic and painted parts, such as white spirits (mineral spirits), and 'flushing out' affected areas. Compressed air (canned air for those without a compressor) is necessary to help flush away old grease and debris, along with the applied solvent. Short and long-bristled brushes are useful in this cleaning process.
With the above in mind, this video is a resource for the disassembly of a Lettera 22 typewriter when a general cleaning just won't solve an issue. Always use solvents in a well-ventilated area, and be sure you have the appropriate tools for disassembly. Do NOT use power tools!
You may only need to disassemble a little of your Lettera 22, in which case maybe only the first half of the video is useful for you. Judge carefully, and don't disassemble unnecessarily.
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