Matthew
Thanks for mentioning Whitworth,I knew it existed but couldn't remember the name.I have asked at tool stores about a third older wrentch size and they did not know.I have an old 2 ton Wadkin table saw.For adjusment I use"the metric adjustable"but some bolts require a socket.Hopefully now I know the name I may find the right tool.Interestingly enough the allen bolts fit my keys.I also wonder how old this saw is.
Thanks
Larry