Hi Jon, I had the same situation and sorted it out thus, this summer; I found
the tie-bar fitted during MOD 74 was re-useable without any changes, but i had
to replace the rear lift pins (which meant opening the wing up again to gain
access to the nyloc nuts), fit the articulating rear pin sockets in place of the
originals - ensuring that the wing sweep does not change, change both sets
of spar bushes to accommodate the larger diameter pins and install the (new)
spar
strap. Karen shopuld be able to sell you the "MOD52 post MOD 74" parts kit
. . . I hope that helps. Clive.
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