Nikkor 20mm f/3.5 AI repair / service

I've loved this lens for a while now for its a ability to resist flare like no other vintage Nikkor I've used, but I've put off servicing this lens since theres been NO online repair resources/service manuals available, not even from the usual places that may have alerted us to identified gotchas. In the end, I decide to attempt the service regardless given recent successes in servicing other Nikkor AI/AI-S lenses.