No not a spinner nut...
Rather a seperate lock nut like this
http://www2.towerhobbies.com/cgi-bin...?&I=LXL761&P=7
( search for Higley's on Tower ).
I use these extensively for 4 strokers and sometimes on two strokers.
On 2 strokers merely cranking the prop nut as tight as possible with a 6"-7" wrench will work.
On four strokers a lock nut is needed.