Hi Paul,
The rear front-wishbone blocks break because of the sliding motion of the wishbone going back on an impact, so if you have the nut on there loose and the front block is tightened and screw not bent, it should stop this - although many of us, me included, don't run the nut as it does tend to tighten and bind the wishbone up.
So perhaps threadlock the nut on loosely.
Ive snapped 2 of these, both times in big crashes - hitting stationary car on the straight at full speed. But both times ive also broken a wishbone, severely bent the screw and crippled the front block too, also the pin bent. So unavoidable/expected damage.
With the front block tight, this new brace on, and nut loosely on the back the rear block should be as safe as it can be I reckon.
Come on Steve, send me my braces, im dieing to run these....
