Try the Day Sailer Association
You might find someone on the DSA web site who has a spare mast that they would be willing to give to you, or at least sell it at a low price. Often a racer will replace their mast even though it is still usable, they just want a "better" one. Sails are often replaced when they are still good enough for us non-racers.The DSA is VERY interested in promoting the Class and encouraging new Day Sailer owners.Is this a Day Sailer I, II, or III? If she is a DS II and you would like an owners manual/rigging diagram, let me know. I have compiled an enhanced version of the original O'DAY sheet.