As long as the shaft size is the same it will be OK to cut the threaded section off.
The Series III uses a metal shim/thing (there must be a technical term) shown bottom left in the picture here  PSK 1066 - Series 3 Knobs Kit
Once forced on it should stay there but can be removed with force.
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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