I want to build my own vacuum-hanger…, but I can`t find where to buy Theraband tube with an outer-diameter about 1,2” (2,8 cm.) and an inner-diameter about 0,7-0,8” (2,0 cm.). I live in Denmark and I have searched the internet with no result. Can anyone help with a www……….adress. I`ll let you know, when I have finished my project.