Thin-wall spark plug socket?

Thanks for the suggestions (especially the 5/8" hex plug info) Time to buy one (or eight) Denso plugs! :)
That would definitely be easier than modifying a socket, and cheaper than buying one!

The problem with making wrenches, etc. is that there just is not room for me to reach up in there and turn it. It's a perfect storm of obstruction by header, inner fender, motor plate, K-frame... there's a reason why I took a holesaw to the fender.