Great job!!!
If it means anything, eethan is on the right track. My blades match some reference I’ve been allowed to see. The collars are a little thicker than the fiberglass wall, and they support the inner bushings when you hammer them in. I use metal epoxy in there for good measure, and then run the set screw(s) through.
The blades seem to be all different sizes. The pipe stunt has a short thick blade, the hero ESBs look like complete blades and the ANH ones seem like 8 footers cut down, just a guess but my current ones are 5 footers cut down.