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Paul, the one thing i see there that needs careful scrutiny, is the offset axis on the damper eyes, take the springs off and cycle the a arm through its full range to check for binding before its made final, its normal engineering practice to align the two fixings on the same axis as near as possible, it will have a rotational moment on the damper i would guess, this can load either the spring perches/spring, or the fixings, and the single shear lower one needs all the help it can get, i know the spherical eyes take a fair bit of miss alignment, but they work VERY hard in that plain, then have a heavy spring with a LOT of leverage acting on it to cope with, then it can bottom out, and bingo, busted bolts, one reason why the Porsches have a longer travel/ shock, not by much, but they are longer. regards, Johnny.
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