Once again thanks a lot Dean :)

Homing set at about 15% at the moment but the machines not running that fast anyway.'good to know what numbers to possibly aim for once comfortable.

I'm pretty sure the screw in question thats making the noise was the one with a slight bend in it. I would imagine this could cause that? I have straightened it but can't get it perfect. I will keep an eye on it and see how it all goes.