Tom, Not sure but that may be a wire/rope sheave. Look at this pic of a couple of wire/rope sheaves:
https://drive.google.com/open?id=0B_sb5TfIENvsTzNCZWtUQ2JQeVE The wire sheave on my 35-1 is about half as wide as your sheave appears to be. Dennis C. Touche' 35-1 #83 Mandeville, LA On Mon, May 15, 2017 at 9:50 AM, Tom Lochhaas via CnC-List < cnc-list@cnc-list.com> wrote: > Thank you all for your suggestions. I have decided to replace my > wire-to-rope halyard with 3/8 Samson MLX (doublebraid cover over Dyneema > core). Now my only question is whether to strip to the core for the "wire > section" of the new halyard. For me, there is still the sheave question. > Several of you have said your existing sheaves took a larger rope, others > replaced the sheave. I do believe my 1980 LF38 main halyard sheave was > intended for wire only. I don't believe I can show the photo here on this > list, but I have placed it in a public Dropbox link (below) if anyone is > interested to see it. The close-up shows the existing 3/16 wire in the > sheave. Very careful measurements of this and other photos at different > levels of magnification and angles indicate the sheave width (at the top > inside - without jumping up on the "rim" of the sheave) is slightly less > than double the diameter of the 3/16 wire. To me that suggests that even a > 3/8 rope could squeeze down into the sheave under tension and cause a lot > of friction or chafing. Seems best to strip to the core (stripping to core > said to be ok with this line) for the section from inside the mast to the > sail head. Comments? Dyneema at this size is supposed to be >8000 lb > strength, so I think even a knot on the shackle wouldn't weaken it to any > dangerous level. (I have no splicing skill.) Double bowline for slick line > (tightened up under winch tension) or other suggestion? Thanks. Photo at > https://www.dropbox.com/s/gb7cg1b9rovjz56/DSC_0150cropped.jpg?dl=0 > Tom > > > >
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