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don't think I've seen aftermarket pcb's.
I'm surprised the aftermarket motors aren't up to it, I'd have thought they could be made better by now.
I remember one of the 24s I did for you had/has an aftermarket one fitted, it felt alot lighter than a Dr Johnson one
IIRC I seen a DC24 cleaner head service kit the other day for £33ish ON eBay, it consists of a brand new brush motor, sole plate, brush and end cap which I thought was pretty good for the price, sold by Imelectrical IIRC