Randall wrote <"FWIW, my upper arms have been reinforced by "boxing" or
across the open underside. Not sure how effective it is, but they've
on there for a whole lot of hard miles and no signs of cracks. >
I also once had a TR3a upper A-arm break. I did had a spare later "parts"
chassis out back that gave up it's good A-arms for replacement. After I pulled
the good spares off, I found their undersides "boxed" as Randall described.
The parts were all original factory pieces, so it looks like at some point,
Triumph realized there was a weakness and decided to reinforce the A-arms. I
am not sure when this occurred, but probably some time after my old TR's 1959
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