I tried using a set screw in the rear of the arm, this was a pain and not the best thing to do as you had to cut the pins shorter if you bent one. Now I drilled a hole in the chassis to put a steel screw into that is very close to the hinge pin. Now the pin can only move very little until it hits the screw head and if you break/bend something, you use stock parts and do not need to modify anything else. Next time I'll try to move the screw a bit closer to the arm.
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