You're a champ !
I'm not fussed about swivels (neither for nor against) but I'm a huge fan of Kenter joining shackles, and I've been looking for a small one forever to attach my anchor
of last resort to my primary chain
is a purpose-built Fisherman with telescopic shank and folding flukes, bigger (and heavier) than I am when it is deployed. (I, in contrast, am never deployed)
It has a shot of 16mm chain permanently attached, to a pin welded through the hollow (heavy RHS) shank ...
(in case anyone else is interested: ... which emerges slidably from a larger RHS shank, to the far end of which crownplates are welded (in that respect, it's similar to the Belfast anchor popularised by Nicolson - the other one. I changed the design so that either fluke can optionally be left folded against the shank, but develops full resistance and strength if the anchor somersaults and it becomes needed. A bit like a Danforth, in that respect. The flukes can be set to either of two angles. The stock hinges out, driven to do so by the shank extending).
I built it for a bigger vessel, but for the vessel I'm now contemplating, I'll be down to 13mm (1/2") chain, so I need some quick and relatively failsafe way way of marrying the two .
I see Anchor Marine
do a 16mm Kenter, and if so, I think it would be ideal for my purposes. (Apart from anything else, I'm a big taper pin afficionado)
Fingers crossed that they actually stock them, and thanks again !