Thats a bit technical for me but i will pass on the info to whoever i get to set it up,i was needing a measurement in mm as thats about the limit of my capabilities.stu,yeah,i could do with the bushes as im going to sell all the bushes i dont need anymore.im away the now but ill give you a shout when i get back next week.i dont know if theres a better setting that somebody knows the approx measurement i could set them at to start with?