I'm getting ready for when the warm weather arrives, and I've got a damaged main halyard sheave on my Capricorn mast - missing bearings and a small chunk taken out of one edge. I've been trying to find a replacement online, but I can't find one that matches all of the dimensions. It looks like a Harken bullet block or Ronstan sheave, but the closest matches I could find are the Harken H160, Ronstan RF1020, and the Holt Allen HA4086, and even on these, two out of three measures are only close to correct but won't fit (too wide, bore too small/large). The sheave dimensions are 1 1/8 dia., 3/8 width, and 5/16 bore. The manual calls it a GYS012...is that an custom size just made for AHPC?