Clutch puller thread size for 1979 Drifter 340

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I finally pulled the engine to change the crank seals which have gone unattended since I've owned the sled.  Last year I bought a used clutch puller that was advertised for my sled but it simply does not fit.  The part number on the bag is 11-1146 and the threads are way too big.  Anyone know the thread sizes for the clutch puller as I suspect the bag is correct but the puller is not.

Thanks in advance!  Steve D

[rminier]

 I think.....not positive.....Arctic Hex clutches used a puller with 9/16 X 18 thread.

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I think.....not positive.....Arctic Hex clutches used a puller with 9/16 X 18 thread.

Thanks Rminier, is that the same size as the spark plug threads?  I feel I can thread the plug in a couple of turns, but afraid I may mess up the threads if not the right size.

[rminier]

 They are really close, but I think spark plugs are 14 mm.