ND DD 2 Speed question.

[szathmarig]

How do I remove the screw on type cog? I want to swap out the cogs, but not sure how to unscrew the original cog. Do I need a special tool? I got the ring off already, and I don't want to break the gears inside, so I need some advice.
Thanks.
Gabor

 

[kwoodyh]

Chain whip and it has left hand threads.


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[spoker]

if it were me id be gettin out the high speed grinder