registered watcher reporting no such instance

The following code snippet works and returns a valid oid value;

    netsnmp_register_read_only_ulong_instance("myVar",
                              myVar_oid,
                              OID_LENGTH(myVar_oid),
                              &myVar, NULL); 

I then replaced it with a consolidated watcher;

   /*
     * myVar uses a consolidated "watcher" helper 
     */
    netsnmp_register_watched_scalar(
        netsnmp_create_handler_registration(
            "myVar ",
            NULL, // access handler funtion
            myVar _oid,
            OID_LENGTH(myVar _oid),
            HANDLER_CAN_RONLY),
        netsnmp_create_watcher_info(
            (void*)&myVar ,
            sizeof(myVar ),
            ASN_GAUGE,
            WATCHER_FIXED_SIZE));

and now when querying the MIB, I get "no such instance".

Can anybody see anything obvious that I may be doing incorrect?

thanks
--
Paul D



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