Copydex Joint Master Manual
The 'Jointmaster' was first offered for sale in the 70's. (A decade earlier the name of this device would have suggested an entirely different purpose!) Described by its manufacturer as a 'precision made sawing jig', these odd things turn up from time to time in my area. It's a die-cast tool with a stove enamel finish, which holds workpieces by means of plastic dowel pins in order to make cuts between 45 and 90 degrees. It originally retailed for £4.50. In it's Mark I form, it apparently won a Gold Medal at the 1972 International Inventors Fair held in Brussels.
The Joint Commission Accreditation Manual
The jig was produced by the Copydex Manufacturing Company, Ltd., with headquarters on Torquay Street in London, England. Copydex seems to have been best known as a manufacturer of glues, particularly a fishy-smelling rubber cement reputedly invented by someone with the improbable name of 'Jim Bean Sherwood.' Apparently, among other uses, actors applied it to ensure that their false eyelashes remained in place during long theatre performances. How they put up with the constant fishy odour isn't recorded.
Universal Joint Task Manual
I have just sold mine but scanned the instructions for posterity, in case anyone anywhere finally gets-around to learning joint-making skills on it as they suggest. I can't help with spares though. The dowells looked as though they could be improvised with wood. There were some rubber grommits. And maybe something like sprung steel from any old clock-type spring would work to guide the saw?
Or sprung nylon? Improvisation skills are required. Oh, here are the instructions I don't mind if anyone copies the images onto other blogs.