[Xaveryptak]

I have LTX1142 with double blades timed deck. After mowing a piece of carpet the blades started to hit each other. I got new blades and attempted to install them. The trouble is that if the two arrows on the pulleys are aligned as per manual the blades are in wrong position. If I align the blades @ 90° the arrows are off. Can I still install them like this or what do I need to do to align both blades and arrows? Thanks