My Tayana 48 came with wire and rope halyards and as part of my refitting efforts I replaced them with high-quality Dyneema double braid last summer. After wintering in the Caribbean on the boat and bringing the boat back this spring, I found that the cover on a couple halyards and the topping lift has worn through. I bought what I thought was good cordage, so why did this happen? I also broke the block on the mainsheet. It was an older block, but appears to have been made of plastic with metal strapping. I’d like to replace it with an all-metal block so I don’t risk breaking it again, but I’m not sure what kind I should look for.