It started looking something like this:
I needed to narrow it down to fit on the stem, so hacked the sides off. While I was at it I cleaned it up some. This is what I ended up with. It'll darken up some with age - at the moment it looks rather ghastly pale:
To give an idea of size, it's 115mm long. The wood screws are 3" 18 ga, and the bolt is 3/8". The plan is to drill a hole in the back of the fitting, turn the end of the bolt down some to fit, and either silver-solder or TIG it in place. I haven't decided which yet - the bronzes are not the same - the fitting is manganese bronze while the bolt is silicon bronze, so TIG may not be appropriate. I might try with an offcut first to help decide.
Next I turned the head of the carriage bolt down and turned an M8 thread into it, then bored a hole into the back of the eye, which I tapped M8 to match.
I assembled it with some flux and ran some 56% silver into the thread to hold it nice and tight. I'm confident the bolt isn't going anywhere.
Finally I polished it up a little and installed it on the boat, using sikaflex as bedding compound. Here's me showing rather more plumber's crack than is seemly, wishing my arms were longer and doing the nut up in under the anchor well:
It's additionally held to the boat with two 18ga x 3" screws, so is nice and solid.
And in context:
I reckon that'll do nicely.
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