c903, I' m confused as to why you feel testing the heads in the manner you did correlates to their potential for blade retention during a frontal impact? Perhaps I simply misunderstood your explanation of your methodology...

I understood you to say that you suspended weight from the head with the ferrule horizontal with the blade the weight was attached to being straight down. Is this correct?

If so, wouldn' t such testing more accurately duplicate pressures the blades are likely to encounter if the ferrule was vertical and the weight suspended of the back of the blades? Otherwise, I think the test simply tells you that the blade retention lips are strong as long as they are properly supported by the tip and ferrule collar.

If my understanding is correct, perhaps a retest would yield different results as 5-shots previous testing have supported? But perhaps not, based on Rack' s experience in 3-d foam...