This might save you some time
if car is a driver.
I use "ejector pins'' used when manufacturing plastic injection molds.
They come in size increments of 1/64 inch so finding a standard 15/64 inch (.234 inch) mirror pin is not a problem.
They are hardened so use caution and wear safety glasses as they might shatter when hammering on them.
I leave the head on the pin and use a die grinder to cut to length.
http://websales.amtektool.com/viewit...-ejector-pins?
Click on small diagram near top of the page to display a condensed table of sizes available.
http://websales.amtektool.com/image?...P-prodinfo.JPG
The only down side is that you can not knurl the shaft to hold the pin in.
If fit in door side of hinge is snug you do not need to knurl them though.
Also the head is the wrong shape for fine point judging but for a driver shape does not matter.