I don't recall any of the repaired front pad spigots ever failing and we did quite a few over the years. No doubt some are still out there performing well in their civilian lease of life. While pinning the front pad was never tried, fitting collars certainly was. But to be honest, if you've got 3 solid screw shanks, albeit 4BA, tightened down while v.hot and then shrinking down to finally clamp-up and with tinned mating surfaces, why over egg the cake?