I did this rebuild on my J-20's carb a while ago, but the files were giving me trouble, so it took me a while to finally edit them down to something manageable.
So, here are the links to the mind-numbingly detailed videos of me narrating every step in the rebuild:
2150 Carburetor Rebuild, Part 1- Removal
2150 Carburetor Rebuild, Part 2- Disassembly
2150 Carburetor Rebuild, Part 3- Reassembly
2150 Carburetor Rebuild, Part 4- Choke Adjustment
This will be incredibly non-entertaining for those who have already rebuilt one of these, but I do see questions from first-timers every once in a while, so thought this might be of use to somebody new to this process.