If you are fitting it like that of course it will come off it needs a nut to hold it on and I'm not seeing any thread there. Sprockets are either splined,tapered or keyed and held in place with a nut as per the exploded drawing

Entire Thread
Subject	Posted By	Posted
Help with Atco Clutch	gml	17/01/16 07:05 AM
Re: Help with Atco Clutch	paul_c	17/01/16 08:30 AM
Re: Help with Atco Clutch	CyberJack	17/01/16 11:01 AM
Re: Help with Atco Clutch	gml	17/01/16 03:36 PM
Re: Help with Atco Clutch	Greenpool	31/01/16 05:34 PM
Re: Help with Atco Clutch	Greenpool	31/01/16 05:47 PM
Re: Help with Atco Clutch	CyberJack	31/01/16 06:09 PM
Re: Help with Atco Clutch	Greenpool	31/01/16 11:47 PM
Re: Help with Atco Clutch	Greenpool	31/01/16 11:57 PM
Re: Help with Atco Clutch	gml	07/02/16 07:12 AM
Re: Help with Atco Clutch	gml	07/02/16 08:16 PM
Re: Help with Atco Clutch	gml	09/02/16 10:19 AM
Re: Help with Atco Clutch	gml	11/02/16 09:55 AM
Re: Help with Atco Clutch	CyberJack	11/02/16 12:16 PM
Re: Help with Atco Clutch	gml	11/02/16 08:31 PM
Re: Help with Atco Clutch	CyberJack	11/02/16 09:40 PM
Re: Help with Atco Clutch	gml	11/02/16 09:48 PM
Re: Help with Atco Clutch	paul_c	11/02/16 10:44 PM
Re: Help with Atco Clutch	gml	12/02/16 07:38 AM
Re: Help with Atco Clutch	NormK	12/02/16 09:23 AM
Re: Help with Atco Clutch	gml	12/02/16 09:28 AM
Re: Help with Atco Clutch	NormK	12/02/16 09:47 AM
Re: Help with Atco Clutch	gml	12/02/16 11:39 AM
Re: Help with Atco Clutch	CyberJack	12/02/16 12:38 PM
Re: Help with Atco Clutch	NormK	12/02/16 01:46 PM
Re: Help with Atco Clutch	paul_c	12/02/16 06:35 PM
Re: Help with Atco Clutch	NormK	12/02/16 10:20 PM
Re: Help with Atco Clutch	CyberJack	12/02/16 10:31 PM
Re: Help with Atco Clutch	gml	13/02/16 05:37 AM
Re: Help with Atco Clutch	paul_c	13/02/16 07:09 AM
Re: Help with Atco Clutch	NormK	13/02/16 08:57 AM
Re: Help with Atco Clutch	gml	13/02/16 01:12 PM
Re: Help with Atco Clutch	NormK	13/02/16 01:37 PM
Re: Help with Atco Clutch	gml	13/02/16 02:32 PM
Re: Help with Atco Clutch	NormK	13/02/16 05:20 PM
Re: Help with Atco Clutch	gml	15/02/16 08:40 PM
Re: Help with Atco Clutch	NormK	15/02/16 10:51 PM
Re: Help with Atco Clutch	gml	16/02/16 01:19 PM
Re: Help with Atco Clutch	NormK	16/02/16 01:36 PM
Re: Help with Atco Clutch	CyberJack	16/02/16 02:40 PM
Re: Help with Atco Clutch	paul_c	16/02/16 05:24 PM
Re: Help with Atco Clutch	gml	16/02/16 08:08 PM
Re: Help with Atco Clutch	CyberJack	16/02/16 10:09 PM
Re: Help with Atco Clutch	gml	17/02/16 07:52 AM
Re: Help with Atco Clutch	Greenpool	18/02/16 12:07 AM
Re: Help with Atco Clutch	gml	18/02/16 09:06 AM
Re: Help with Atco Clutch	CyberJack	18/02/16 12:09 PM
Re: Help with Atco Clutch	Greenpool	18/02/16 11:09 PM
Re: Help with Atco Clutch	gml	19/02/16 05:44 AM
Re: Help with Atco Clutch	Greenpool	24/02/16 10:56 PM
Re: Help with Atco Clutch	gml	03/03/16 09:26 PM
Re: Help with Atco Clutch	Greenpool	06/03/16 12:34 AM
Re: Help with Atco Clutch	gml	06/03/16 07:56 AM

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