thanks guys, I took the ledge plate off, struggled to put it back but seems to seat better on it now. Stuffed if I know what I did. There does not seem to be any elongated holes so that you have the opportunity to move it slightly away or towards the target 
Maybe that's why the ops use the bending method???
No elongated holes in the assembly brackets. But sometimes smaller screws (in diameter), and these allow movement.
Could also simply be that a previous owner may have lubricated the area, which is always a bad idea as over the years all the crap gets attracted and the moving parts become sloppy - this causes all sorts of issues.
