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These photos are of the gooseneck on my 1992 2023A. I no longer use this gooseneck . Instead I use the Ronstan RF512 Fixed Gooseneck shown in the last photo.
These are the gooseneck parts.
The aluminum shaft is 7" x 5/8" dia. The two holes in the shaft are .250" Dia. The first hole is .625" from the end. The second hole is 5.625" from the end. The hole that goes through the plastic part and the shaft is .250" dia. and is .438" from the end of the shaft with the plastic part on it.
The plastic part is machined from a 1.375" dia. nylon (?) rod. The distance across the two machined flats is 1.094". The part is 1" long.
This universal joint has seen better days and is one of two weak points in the design. (The other weak point is using aluminum instead of stainless steel for the shaft.) The material is .062 thick stainless steel. The four "tabs" are 1.125" wide. The holes in the "tabs" are .250 dia. and the hole center is .406" from the tab edge. The space between each set of tabs is different. One set is 1.125" and the other probably was 1.5". I can't say for sure because the part is bent so badly. There is also a .250" dia. hole centered on the common surface that the tabs extend from. For some reason, this hole has a countersink on the side facing the tabs that are 1.5" apart.
This is the Ronstan RF512 gooseneck before I mounted it on the mast. Since I will leave my 2023 on a mooring most of the summer, I can live with having to remove the boom to unstep the mast. Also, I prefer to reef my main "the old fashioned way" so I don't mind not being able to wrap the main around the boom. I did have to make the part to attach the gooseneck to the boom, but that wasn't difficult to do.
Hope this is helpful to you.
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