Great video, thanks for posting it up.
So many people just replace distributors with second hand items these days with out knowing they are quite simple to work on,
A few things to note for people with out access to a timing light you will need to accurately mark the distributors position before removing it to try and maintain correct ignition timing,
Checking with a timing light is always advised though,
Another thing, silicone grease is a much better lube for assembly of oil seals and O rings than engine oil