Not quite a vid, but i took several photos along the way. You may find them helpful, you may not.
This is for a purefreedom reel.
Once i took it apart, i found the correct drill bit to match the pre cut holes in the cog and sat the cog against the side of the reel. Marked the holes and drilled. I also needed to use a saw and trim down the red spacer already on the reel.
Pushed a bolt through from the inside out. I used two nuts on the thread to space the cog away from the reel. This proved difficult as i had to build the reel back up at this point. So long nose pliers and a spanner came very handy.
So its the side of reel, 2nuts (acting as a spacer), then the cog and secured with bolts.
https://www.instagram.com/p/BRZPCxVgRA5/https://www.instagram.com/p/BR1fvQbg9mR/