Hello again Dan.
I think there is something in the splines being the next weakest link. I am waiting trial some higher temperature resistant inserts. These are also a slightly different shape to reduce an annoying rattle from the gearbox on tickover and I am sure they will be kinder to the splines. My problem now is that my Centa has a good spline set up and so will not fail, making testing impossible from that point of view.
It seems that nothing is easy!
