Chris Wong, thanks for sharing. It certainly seems feasible and more elegant than PVC. Also, just plugging the hose into the top of the arm is much simpler in terms of setup/breakdown as well as weight savings. As I said in an earlier post, my one problem with that approach is that you are committed to a certain length hose. If it's too long it will snag on things or become cumbersome. If it's too short you won't be able to perform certain tasks. You have two options the way I see it. Either you have different length hoses for different tasks or you go my route where you use clips and can modulate the length of hose coming off the top of the boom arm. I like my way because I use my boom arm for a myriad of tasks that require different lengths of hose. But people who plan to use their boom arm for one specific task may prefer yours. Carpenter/woodworkers choice. I use mine primarily for cutting ipe pavers, but I have also used it to break down sheet goods for stain grade deep soffit covered porches, siding etc. When I need a longer length of hose I can either feed more hose through the clips or pull the hose out and re-snap it back in at a different length. Again, I don't have a bias one way or the other, but my needs/interests require more flexibility.
Also, as soon as you start moving into different heavier/more rigid materials such as stainless steel. The more unrealistic my boom mount becomes in it's current state. The easier it becomes to tug on the hose and permanently alter the t-track, the less realistic this solution becomes. If one were to go with steel, I would definitely anchor the mount to the v-groove on the top of the mft extrusion or the t-track on the underside of it. If you're using 80-20 then it's even more variable based on the profile you've chosen. I could be way off base here, but this is how I'm thinking..
Cheers and thanks for being a part of the discussion