I have a set of mid-century modern dining chairs. The seat is supported in four corners by four metal dowel pins that insert into the legs, but have a hole in them for a screw to pull the seat down against the metal dowel pins. We're missing several of them and I'd like to repair each chair with similar parts if possible. They're about 8mm in diameter and maybe a few centimetres long.
I've added an image of the part, but I have no idea what it's called to search for replacements. I've tried searching for metal dowel pins, but none seem to have any holes in them through which a screw could pass. Is there a special name for this part? I'd love some links to a place where I could buy them online (in Canada if possible!).