I'm only familiar with the flanged shear pin arrangement but I suspect the taper shaft with specific torque specs is the safety release for what you describe.
Check the old and late parts books, that part may be backwards convertable
My books show shear pin came in at 9T308 I don't know if parts from a 9T machine will fit a 1R some part # are the same in both parts books.
shovel man.
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