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I needed a 5-blade fan for a build, but I noticed that all of them looked the same... ridiculous. Every fan in my parts bin had disproportionately spaced blades. This would not do, so I decided to make the 7-blader in my kit into a 5-blade with appropriate spacing. First, I cut all but one of the blades off. I did this so I could line the tilt of the other four up with one of the originals. Cut the blades off as close to the center hub as possible without marring up either the blade or the hub. I sanded the nubs off of the hub and cleaned up the four best-looking blades. I then measured the distance around the hub with a piece of tape, and divided by 5. My hub was roughly 35/64" around, so I made a mark on the tape every 7/64". On each mark, I piloted a hole with the hobby knife and drilled it using the smallest bit I had. I drilled another hole in the end of each blade, where it would align with the hub. I used a bit of wire in the hole on each fan blade to pin it to the hub. Finally, I used CA glue to attach everything, making sure the angle on each blade was close to the original one that I had left on. I hope this helps!