Ok started a discussion in text and decided to bring it out in public.
Built a mini boom out of a piece of 29mm carbon paddle for my 5m F-One Swing and I like it but it’s too thick. Thinking 25mm OD thickneas is right. Ebay has lots of 1M pieces for sale.
I bought some 1" (25mm) wide dual sides Velcro strap to hold it to the handles ($7 Amazon) and some 2" (50mm) heavy duty self adhesive Velcro ($17) to stick on the boom. I have enough left over to last a lifetime.