Hi,
I am trying to repair a venerable HP 8662A Signal Generator. No need to make the presentations of the generator I guess.
During my repair, I noticed that two key springs were missing. Unfortunately, these key buttons are very hard to find now. Or at indecent price.
Fortunately, I found one of the missing springs in the enclosure, but only one. So I had to find a solution for the missing one. And while I was waiting for a quotation from a local spring manufacturer, I had the idea to try to use some packaging plastic and cut a poor-man's spring in that. I tries several widths, and found one that seems to work just fine. The feeling is a bit softer than the other keys, but overall, it works very nicely. Not sure it will last a long time, but hey.
Just in case, might help.
If someone is interested in the repair of the generator itself (for which I had several issues with the PSU and the LF section), I am writing a series of blog posts on
https://whatever.sdfa3.org/hp8662a-synthetized-signal-generator-part-1.htmlDavid