Hi the bush is made of rubber and it is fixed but is very flexable ,i clamped the bush in a vice as tight as i could and marked its position in relation to the vice .I then measured its movement up and down and it flexed 24 inches up and 24 inches down from horizontal before it started to twist in the vice if i could have clamped it tighter im sure it would have flexed some more . I originally thought the same ,that it would be to rigid and was going to see if poly bushes were available to allow more flex , but for now i think i will stick with the original bushes and see how it goes . Aparrently some of the safari racers are now useing these arms on there racers .
cheers
Richard