Hi Guys,
i also did the 501x Mod on my BJ4.
The first A-Arms where modified to fit the original Bulkhead
and last 4 races with big impacts, but i have broken them by
trying backflips on our big jump.
They broke on the grinded, modified inner hinge pin holes.
After this, i modified the bulkhead to fit the new a-arms in original shape
and have no probs since this.
For the 3mm pins i use titanium in long axles from titan-concept.com,
cut them by a dremel into the correct length and the costs are about 5€
for the complete car.
have fun........
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