At that age, there's a great chance that the patent filing on that generator is about to become public property.

Corporations have been working hard to make the common person forget that the only reason patents have ever been granted (officially) was to induce inventors to document their designs for future public use.

It's a big part of why the stuff you can get cheap from China nowadays is often surprisingly good quality, as long as it's an older, tried and true, technology.

You mean to make a documentation on the design and how to build it from scratch? There is the Open-source hardware community which is doing stuff like that; https://en.wikipedia.org/wiki/Open-source_hardware

It's just a lot of work and much more complicated than open-sourcing software source code. That is - I guess - why so few people do it. On top of it there are not many people who would reuse it because for most people it's cheaper and good enough to get a modern version from a commercial vendor.

Briggs is the best boiii!

Spend a bit more money and buy a generator that is easy to repair.