Pagoda 2 Omni FPV Antenna Spacers (Protector)

I just got some Pagoda-2 antennas from Farvew.com and they provide an STL for a protective shell but I was concerned about the disks getting out of alignment, so I whipped up some spacers. The design thickness for the top is 3.65mm and the bottom is 10.45, but on my printer they come out a hair thicker than that so I used a bit of sandpaper and a caliper to get them to exactly the proper thickness.

I was planning to secure them with shrink tubing but the only size I had that fit was quite a