I recently switched from 27mm to 36mm hose on my CT with boom arm, and found that I could no longer hook the hose over the tool hangers on the boom arm. So I decided to design my own hook for attachment to the 45 degree part of the boom arm. It it large enough to "cradle" and retain with the 36 or 27 mm hoses. Below are pictures. I've also made it available for sale at Shapeways.com at these links:
Hose Hook Top
Hose Hook Bottom
You will need two M4x16 screws and nuts to attach it.
Hose Hook Top
Hose Hook Bottom
You will need two M4x16 screws and nuts to attach it.