Evvy,
I am pretty certain I found the cause:
View attachment 879159
the Bracket # 43 is mounted to Fiberglass Disk # 44 with rivets
One rivet broke out on the disk side from centrifugal forces and vibration
this send the assembly off balance and it self destructed
the DoD design uses here hex head bolts with lock washer which screw into a thread in the bracket
View attachment 879160
also,
the disk is mounted to the assembly by means of
MS90725-5
Military Standard Hexagon Head Cap Screw
Description:
Fastener Length: 19/32", Thread: 1/4-20, Thread Length: 15/32", MS90725 series screw #26 with split lock washer # 27
View attachment 879162
You got this here (with remains of the fiberglass disk)
View attachment 879163
View attachment 879165
I am pretty sure that one of the rivet connections failed first.
This is completely different from the original Marathon and DoD design in the TM’s
This qualifies and gets the PPD award
Peter