In the worst of case you can probably get chinese made replacements; they might be all fine, or they might need slight tweaking to run smoothly (like sanding down edges if the metal cut out isn't accurate enough). Either way, both the 117 and 540 are superb machines, and with a bit of time and patience you will find replacement parts at a more acceptable price. There were a few early German ziggzaggers, I think Mundlos might have had the first domestic zigzagger. Pfaff 130 came a few years later. There are a few vintage related groups on "groups.io", maby a few are still active on yahoo; they can be very helpful with info on where to get replacement parts. Don't forget Helen Howes in the UK, p&p isn't that expensive for small parts.