I couldn’t find any photos of that bolt tube I made, so I took some photos and posted them here -
http://1703.x.rootbsd.net/Bolt-Tube/
It’s pretty simple really... just section of 1.5” PVC tube with a cap glued on one end, and a screw seal on the other end. The bolt stays wrapped in a rag inside and it’s reasonably tight, but comes out if you shake the tube. It keeps it protected, and I “think” it’s watertight. I’ve read that it’s not a good idea to store steel long term in PVC because of off-gassing though, but it’s fine for what i use it for.
Great idea! You must be a plumber to have that red rubber gasket cap around to use. If you toss a couple of dessicants from new boot boxes into the tube when you seal it, the bolt should be very well protected.