I finished my poly roller reefing jib sail and I put more belly in it then I like, but the roller reefing works and is really cheap and easy to make. I bought a plastic ele. conduit pipe 10 feet long 1.056 od $4. Three plastic end caps about $2 and two metal pipe clamps about $3. And rope I already had. I sawed the conduit into two 5 feet pieces and they fit together and come apart as shown in the middle picture,,so I can break them down for storage in the boat. I drilled a 5/16" hole in the three end caps to take a 1/4" rope. The roll up rope is only duck taped on but will be fitted into a drilled hole later. The wind up rope wound up into a perfect roll by itself. It was one of those project where every thing some together without a bunch of problems.

John