I commented yesterday that my B blades had split at the hub, so I spoke to horizon hobbies today.
My BIG mistake was to use blue thread lock on the screws, this is a big NO,NO as it makes the plastic brittle.
and cracks the blade.
All new blades come with new screws and dry thread lock fitted. I should have changed the screws with each blade change.
We live and learn. Hope this info is helpful
Keep em flying RGDS Wingart