Step 1: Setup and materials
Gather up all of your blades and measure how long your longest blade is. This will determine how long a piece of PVC you will need.
Find yourself a piece of scrap PVC. You can use schedule 40 like I did of something lighter weight (but not as tough) like schedule 120. I'm pretty rough on stuff when I'm working so I suggest using schedule 40. It's also what I work with mostly and have fitting laying around for. The size of the pipe depends on how many blades you have. I used a piece of 2½" pipe. You will also need PVC cleaner, glue, a cap, a threaded connector and threaded cap.