I appreciate everyone input.

I decided to build my own mast float the same diameter as Mama Bob
but a bit longer than her 22" length.
Mama weighs 5.8lb and is 18" diameter ; i can match the weight and make
it closer to 32" in length, which will reduce the drag a Lot, if it swivels. That also adds
a Bunch more buoyancy;like 30% more.

I'm not gonna be touching it at the top of my Mast; so
it can have that Black-Carbon Twill & clear-coat Look.
My materials can take the heat.
Bille