I have a rotor hub that is almost idenitical to yours. My blade holder is made from garolite grade 10/f4, and have had some spetacular crashes, and have only broken the blade holder that was converted into a delta hub. My curent blade holder is made from 1/8 material, and that is to stiff. I have purchased 3/32 material, but have not made the new blade holder yet. I to have purchased polypropylene for the blade holder, and as of yet, have not made it. I will bea trying to contact you personally for your email address.

Gary Ten Pas