Hi All, Well I have fixed the problem of self adjusting height. I put the rear axle complete with adjuster from the old 125 under it and the thing is as solid as a rock. The spring at the base of the adjuster arm on the old 125 one is thicker and has much more tension than the one that has been giving trouble and is very definate in its engagement, also there is very little vibration of the lever in the sideways direction. All in all a most satisfying fix, and it is only 10 thou thicker and needs about 5 times the force to move it.
Thanks to All who have helped. All I need now is to sort out tne correct blade bolts so that I can stop using 2nd hand bolts.
Thanks,
Don....