This problem was addressed in the early 1990s by David Rutherford who produced a strengthened version with a three bolt fixing and an extra location that is welded to the end of the axle.
I welded a tab on the axle ends and drilled and tapped the lower shock absorber mounting so that it could be removed without cutting of the weld.
Tim Ayres at New Elms has the strengthed mountings; I suggest that you contact them for assistance.
