RE: Whats the trick
I have had plenty, plenty, plentyof Blazers come off when you don't fully cover the bottom of the vane with glue.
I am not saying soak the blazer in glue, just don't skimp and leave areas of the blazer where it touches the shaft without glue.
Hint: Take 300 Grit Sand paper and rough up the shaft and blazer for better adhesion.