Why does the OP believe the motor is “nearing the end of its life”? Unless they are badly overheated, the Astros can be rebuilt. New bearings, new brushes, turned commutator and its new again. The challenge will be finding someone to turn the comm, for example, I sold my brushed motor tools years ago.
Finding a comparable brushed motor may be a challenge today, the Astros were unique in requiring minimal maintenance compared to most brushed motors that size. A replacement will depend on what voltage he wants to run.
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