I have worked out how I'm going to do it, I just haven't done it yet!
What I intend to do this winter is fit a pair of Harken through deck micro sheaves to the pole tip, set horizontally, one on either side of the pole. I'll then fit an internal system with a single line exiting under the pole near the mainbeam with a clamcleat to lock it. The two tails from this line will exit the sheaves on either side of the pole tip and I'll splice hardeyes onto them. Then the dyneema pole guys will have spring clips (or maybe I'll use Inglefield or 'sister' clips) to attach them to the adjustable tails. This way I should be able to pretension the pole even on the water......
John Alani ___________ Stealth F16s GBR527 and GBR538