Hi all, i have a white ride on that has started to leave a strip of grass in the centre of the cut, iv'e sharpened the blades which are not worn on the ends at all,they appear to overlap and cover the cut ok. might be a silly question but do the blades have to be timed in any way, its just like for an instance thers a blade in the wrong place and missing grass, specially in longer stuff, thanks micka