Vic - another foolproof way that J/World teaches for J/24s, also works for J/30...
1. Set the spin pole ring on the mast at the height you want before getting underway
2. Clip pole lift to the ring with the trip line on the shackle facing out so you can grab it. Lock the pole lift shackle in position with just a little bit of slack (eg 1").
3. Rig outboard end of spin pole jaws up with the guy already through the jaws.
4. Clip inboard end of pole to wherever you stow it while underway (e.g. base of shroud)
5. When ready to set, make sure there is some slack in the guy
6. Foredeck unclips inboard end of pole, and slides aft in between mast and shrouds.
7. With jaws up, pick up the pole using the bridle that pole lift gets clipped to
8. Hold the ring on the bridle against the ring on the mast with one hand, use other hand to unclip pole lift shackle, then reclip shackle to bridle ring.
9. Push pole forward with outboard end on proper side of headstay.
10 Attach inboard end of pole to ring on mast track. The pole is magically at the correct height, with nobody having to adjust anything.