Shouldn't be too hard to re-manufacture but you need access to a good mate who can use a lathe. It would also be easier to start off with a casting rather than machining from solid.
I have a 'home made' welder but it uses the two belt pulley. The generator pulley has an extra groove for a belt to run a blower which forces air into the commutator area to cool the motor.

Colin
				
			 
			
		 
			
				
			
			
				'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C, Suzuki SV650
			
			
		 
	
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