Drum Brake Conversion Kit from 10" to 8" tyres rear, closed

Ive just tried to fit my 10" to 8" hub conversion to a px125 engine and found that the edge of the braking surface on the hub contacts the brake shoe pivot lugs so that the hub will not fit all the way on. what is the best option here? Is it worth fitting extra spacer(s) to the drive shaft?

Depending on the motor housing, the brake shoe mount may need to be reworked.
Nice summaries have already been posted online here. Have a look here:

or here:

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Thankyou very much, great website