The video describes replacing the chain-rings on an integrated spider crank. The inner ring is bolted directly to the spider, the middle is mounted to the inside of the spider while the outer is mounted to the outside. They are joined by 5 hex head bolts that pass through the outer ring and the spider, and then through the inner ring into a slotted nut. Installation is straight forward. It is suggested to use a crank removal tool as trying to free the crank arm from the spindle by hitting it with a piece of wood is next to impossible (you can see the results in the footage when looking at the inside of the crank arm. I’ve also heard, that by removing the crank arm bolt and riding around a bit will loosen the crank arm too. However because the spindle is steel and the crank aluminum you’re sure to damage the crank and maybe yourself.
As an aside, the issue I was having with my derailleur was caused by the chain rubbing against the rear fender (duh, comes to mind). I did however have to reset the limit screws on the front derailleur because the chain rings are slightly different than the originals.
Many of the parts on this build came from Peter White Cycles (www.peterwhitecycles.com)