Mark. That picture looks awfully familiar to me at this point in time. I also have quite a few rib tips to replace (between 80 - 85 at last count). The good ones and one's with only a minor crack I plan to reinforce with penetrating epoxy. The rest will need to be re-tipped so I'm all ears on how you approached this portion of the job. My plan is to pre-cut the 2-1/4"cedar rib stock into 6" lengths (with the requisite scarph angle) on the table saw. I may also taper them to "approximate" the final rib-end taper and do the final tapering with a hand plane. I figure then on making a small block/jig with the duplicated scarph angle and then clamp that to each rib to use as a guide when cutting the rib tips using a multi-tool. I think this should work pretty well but any lessons learned by anyone who has done this before will be well received. E.g., would a 8:1 scarph be sufficient or overkill for the rib tips?