Hi Jamboo, I recently did this to my H23
What you will need is:1. new halyards (you can order them from the chandlery here ready measured by boat model for running back to the cockpit.2. Two stand up blocks.3. A deck organizer to make the 90 deg. turn back towards the cockpit.4. A two line clutch.5. A winch, # 7 or 8.I got the halyards here and the rest on eBay, the clutch and winch were used, the blocks and organizer new.You will also need sealant and hardware, some of it 2 1/2 inch to go through the cabin top and backing plates you will need for all this. The blocks I got had SS plates with them and I used 1/2 ply epoxied as a backer for the winch. for the turning block (organizer) I used SS fender washers. Get the hardware at the hardware store or HD.Good luck.