This page holds no instructions, but is a link to a website developed by T. Nakano who has repaired, with pictures included, many Super8 cameras.
http://www.nakanocam.com/index.html
Although the original website is currently 'off line', I have been assured by the site's creator that it will be returning soon. In the meantime the above link will take you to a archived copy of the site held by the Wayback Machine. The site is mainly in Japanese, there are English translations next to each photo of a process. The repairs cover parts that are commonly affected by wear and tear over a broad range of camera brands and makes:
Bolex, Canon, Chinon, Fujica, Elmo, Minolta, Nalcom, and Nikon.
The website also has many tips, pictures, camera data listings, and links. For the "do it yourself" repairer who wants to get into the solder and springs of their camera, this website is a must see.
Photographs courtesy of Takahiro Nakano