x-idler remake for Original Prusa i3 MK2S

I had the problem that the x axis belt always rubbing on the bearing on the right side and I was not able to align the belt right because the hole in the idler seemed to be to near to the frame. So I redesigned this a little bit and made the hole a little bigger.

Be careful not to break the thin wall when you tighten the bearing screw!
Maybe you have to grind the screw head a bit cause there's almost no space between the screw head and the rod of the z axis.

Do not forget to do the xyz ca