Hi Sanchezz, as far as I know, the nut is integral with the starter cup....it is part of it, at least is was on my early Victa. wink
Once the cup is off...you apply Penetrene liberally around the crankshaft and key-way for a couple of days to let it seep in which will make it release easily from the tapered shaft, one the puller is applied.

Here is a pic of the genuine Victa Service Tool for removing the flywheel.... [Linked Image]
Hoping this helps. wink
cheers2

Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.
Kindest Regards, Darryl grin