Originally Posted by Blockhead
Its usually only lack of certain parts, especially needles and bobbins which prevent them from working just as well as they did when they were new.
I would be astounded if my modern machine was still going in 20 years, let alone 100 years from now.
Well at least you can use the 15x1 needles on the machines that you shown. For some of the older machines that use curved needles if you do it just right you can take a commercial needle and heat it up and put a slight bend in it so it can be used. But there were so many machines that use the curved needles that you have to find one that is close to the same length and bend it to match the original.
Also you can still get the bobbins for the 27's they still make them but they are just a tad bit shorter but work very well.
Billy