The question is not entirely clear, so I'll go over 3 scenarios:

1. Plastic spinner
Just use the standard lock nut arrangement. If the spinner is large enough, the spinner cone should just snap/screw on as usual.

2. Aluminium Spinner
You must get the correct spinner adapter for your engine. A 4 stroke spinner adapter will include a lock nut arrangement. The spinner cone screw will screw into the face of the lock nut. Frequently, the spinner cone bolt will need to be cut down depending on the size of the spinner and thus the distance between the lock nut and the tip of the spinner cone.

3. Prop nut.
I have used a Harry Higley prop nut on my OS FS70 4 stroke. HH also makes a 'lite lock'. This is just a nut of the same diameter as the actual prop nut. Screw the lite lock on first and then the prop nut.