Quote:

I've seen this with a 727 but none so far with a 904.

Glad you are going to be OK.



The drum in the 904 being smaller in diameter has
to go much higher in revs to get enough centrifugal
force to blow... remember that if you blow/break the
sprag it turns the drum 2.2 times the engine RPM and
the stock 727 drum lets go at about 13000 rpm