Roller furler
I think it is called a luff extrusion? Anyway, it is the piece of plastic that runs the lenght of the luff on a CDI roller furler. It costs over 200$ and if you stap your headsail to the mast like I do on a Mac 26S, it will extend over the bow pulpit about 2 feet, where it will bounce and bob during trailering untill it finally breaks. I replaced mine last year, and got a piece of pvc rain gutter to help support it this year. Crazy Dave suggests laying the rollerfurler on the deck and fastening it to the stanchions. This may work for some boats and in fact is what my PO did. Unfortunatley, on my boat this created stress on near the top of the luff extrusion. When I got the boat it was broken about 2' from the top. I splinted this together with aluninum strips and 3M5200 and got 2 more years out of it. With the CDI, it is important to keep the luff straight, so I will continue to bugie it to the mast.