a. I'm pretty sure that is a Hood Seafurl, like the one I wrote this post on re-building:
http://sail-delmarva.blogspot.com/2009/09/hood-seafurl-800-bearing-replacement.html
b. You can simply attach the line with a clove hitch with a stopper at the end. I've done this several times, takes only minutes. There is no need to open it and I would not just to replace the line.
c. Yup, decore the first 15 feet. Easy.
d. Bet those set screws are seized, meaning the forestay needs to come loose. Another reason not to.
http://sail-delmarva.blogspot.com/2009/09/hood-seafurl-800-bearing-replacement.html
b. You can simply attach the line with a clove hitch with a stopper at the end. I've done this several times, takes only minutes. There is no need to open it and I would not just to replace the line.
c. Yup, decore the first 15 feet. Easy.
d. Bet those set screws are seized, meaning the forestay needs to come loose. Another reason not to.