I've recently created some videos for disassembly and tuning of the Marlin 336 action. I try to explain everything in detail and some things I've learned.
I've learned a lot from this forum and received good advice (for example upgrading to the Wild West happy trigger!!), so thought it's only fair to give back to the community.
I hope you find them useful:
Part 1 (YouTube)
Part 2 (YouTube)