Wait, wait
Hi again,
Oh dear, the original specs. What is the date on the plans? Even in older versions of Skene's, 5/16" takes a 5/8" pin, unless the wire is a 7x construction; any details available on construction? If the wire is described as 1x19, then either the recommended chainplate has too small a hole, or the wire is oversized for the load. I can tell you from experience that even the justly revered house of S&S was capable of making mistakes.
Please consider at least coming down a size for the backstay; either 9/32" or 1/4" take a 1/2" pin, and the lower will bear significantly less load than the jibstay does, so there is no sense in making both the same size.
Fair leads,
Brion Toss
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