Thanks, GL. Rudy calls them "doughnuts" ... and says they could also be called bushings or fairleads.
Shaeffer no longer makes them. He says that WestMarine sells something called a half-inch plastic "through-hull" for $7 that will do the trick ... all I need to do is cut off the top.
Reading my DSII manual a little more carefully this morning, I see that Roger Conrad talks about replacing "donuts" with one-inch plumbing nipples in his section about Uphaul holes (pp85–87). The process involves threading the hole "with a one-inch steel pipe." ("Use an ABS nipple with a nut on the end.") He says that the swaged end of the cable will pass through this diameter without difficulty and facilitate future removal without having to remove the tang. Once installed, he says to "Add a brass plumbing cap to the nipple and allow the wire to run through a 1/8" hole drilled into the cap's center." Interesting. So maybe learning how to tap a thread is in my future . . . .
Luke writes: Re: More information about this fix for centerboard leak
Postby ldeikis » Sun May 31, 2015 5:57 pm
Also, instead of drilling a hole in the cap for the cable to pass through, I cut a slit in it by putting it in a vice and sawing to about midway across. This allows the cap to be installed or removed without removing swages or clamps from the cable.
Rudy also says I can try gluing my donut back together right on the cable, which I might try first since, having just launched, I'm not anxious to undo either end of the cable just now — the one to the tang on the CB, the other end around the becket (new vocab word -- see below) on the block. Then insert donut with some sort of adhesive and put lots of duct tape over the outside ring as a cushion to get me through the season. . . .
Becket is illustrated in this post I found 9/30/2019. Two other pages where this came from. Thread: New Guy with a Centerboard question
Nephroid wrote: I got the below pages courtesy of Rudy at D&R Marine. [...]
Oday CB Pg 3.png