Inner Nut on Volvo DP-SM Prop

[AMMO DAWG]

I have an off the wall question, I am converting my SX outdrive to a dual prop and I was able to source a lower unit and some props. I'm doing some cosmetics on it right now and was getting ready to order inner and outer nuts. I noticed the propeller shaft if threaded on the very end for the outer nut, however I don't see threads for the large inner nut. I really don't see any threads on the inner prop either. Can someone give some info on what that inner nut threads onto to retain the inner prop. Appreciate any info you can share.

 

[AMMO DAWG]

Sorry, disregard, after staring at the spline for the prop I realized it is the threads - DUH! Thanks much