via Thom Cholowski at Rebel Typewriter Workshop in Saskatoon,Saskatchewan, Canada at https://www.facebook.com/groups/typewritermaintenance/posts/4373364699567612/

Rules of Good Repair Practices:<br /> The Success of the repair depends upon the Rapairman's ability in following the rules of good repair practices. These rules can be summed up as follows:

1. Read the Service Bulletin thoroughly.
2. Know what you are looking for. Never guess. Always investigate the source of trouble. Ask, if you do not know.
3. Determine troubles by the process of elimination.
4. Every part, no matter how small, has a job to perform. Do not overlook the smallest detail.
5. Use the proper tool. Keep tools in efficient working order.
6. Carefully handle smooth, plated or bakelite parts to prevent damaging or scratching.
7. Make the repair like you would want it, if you were the customer.