I have been asked to provide details of how I mounted the mast and outriggers on my new yak. Below are pics and explanations of how I went about it. Obviously for any other yak various other means may need to be worked out, but the principles should be the same.
Firstly I had to reinforce the deck where the mast step was to go to make sure that lateral stresses don't damage the deck.
I glued a piece of 6mm marine ply to the underside full width.
Then I drilled through with a hole saw for the mast step to be inserted through.
I then made a keel block for the mast step to be inserted so that it was braced strongly for good support with no likelihood of damage to the hull. I epoxied it into place then drilled and screwed it in from outside with S/S screws, then sealed them with epoxy/graphite.
Next I fitted the mast step. I won't go into all the detail, but I had to space around it with PVC tube because the hole saw was a bit bigger than the diameter of the mast step.
I also reinforced the deck for the outrigger arms to be fitted. I used 6mm marine ply here to, and I embedded a nut into a piece so that it would be permanently in place. (I didn't take pics of the detail of how to do these, but I can provide details if you want).
The outrigger arms then bolt easily into place.
(Part II in another post. My computer is acting up and I don't want to lose this post.)