I had read a similar incident on a float plane with the cap 140 in the above articles..do you know if the prop your friend had was the 1st 2nd or 3rd rendition of the cap 140? reading what was said in the above articles the prop was re worked and has an approved 3rd generation ..that is suppose to have a 900 hr TBO,.. it was using the reworked Warp Drive prop blades changing the head to occomidate the mechanism of the pitch control head ,..in doing this the machinist put the dreaded 90 degree inside cut ,..I am assuming they are using a radius on the inside cut now ,... a 90 degree cut on any machined part that is going to be assualted by ,..torgue,..and engine induced harmonics creating frequency vibrations that must be off the chart on the high and low side,..it's like cutting glass,..just a scratch and it will break,..I'll have to check on the serial number of series to see which props are 3rd generation,..and do some research on how it's record is

thanks for your reply Steve