I made a quick steam tube out of some PVC pipe for the Marshall bow shoot. It worked pretty good but there was room for improvement. My good buddy Derik aka "Bowtarist" offered to make me a better version made out of aluminum. I put the finishing touches on it today. It's 44" long so I can steam half a bow at a time. I use a wallpaper steamer with it. That is very easy to use and puts off plenty of steam for a bow.
I drilled a hole just big enough to squeeze the steam hose into.
This is what I came up with on the first PVC tube and it worked great. I screwed the thick rubber to a wood plug and cut slots in it. The bow can slide in and it makes a good seal around it. No more messing with aluminum foil or rags trying to keep the steam in.
The opening in the wood plug is 2"x2" behind the rubber so I can fit a bow handle in there if I needed to.