Well made with very close tolerances to keep you fins perfectly aligned. My only suggestion would me to make the “corners” where the fins meet the tube, concave. With such close tolerances, the guide can act like a scrapper and pick up epoxy as you push it into place. With concave corners , this wouldn’t be an issue. You could actually leave some external epoxy to help seal the tube/ fin joint and not worry about bonding the guide to the tube. I will define buy these guides in other sizes as needed.
