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Is there a shaft replacement part for a 2730 series out runner
Go to the product page identical to your motor and find out the dia. and length of shaft from specs.
Not many shafts sold as accessories these days of "throwaway" items. You have to be innovative.
Search for a shaft same length or longer than the one you need. Cut it to length required and dremel the necessary flats for locking with grub screws. If you need one with a D clip groove and cannot find one then use a wheel collet to hold it in place.
If you cannot find a shaft then get a drill blank from local hardware supplier and use that. Much stronger too.