Hi Bushy260,the one in the picture was sold a few years back,your one has a alloy hub for the blade
my one had a cast iron hub which was broken so I used a hub and round blade plate of an old Rover
because it was a few years ago I am not 100 percent sure the exact details but have done a few engine
swaps,one mower engine crankshaft had a wider half moon key so I filed the key way slot on the Rover hub about 1 mm wider then I usually use a flat round blade plate or one with a slight dish some times
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you can turn the round plate upside down and fit blades on top side of plate to get the blades in the
correct height position or make spacers or use washers to lift the engine up from the base,I have a few
spare parts so I just grab a blade plate and check it fits.
I bolt the motor to the base,take the hub off the crank if it is the wrong height for the blade,put a
straight edge (or ruler,tape measure) across the end of the crankshaft and see if a flat blade
plate will work or a dished one or lift the engine up with washers/spacers.