Darktable Great digital photography RAW editor. Alternative to Adobe Lightroom.

Once I started using the tool lending libraries in the San Francisco East Bay, it was a game changer for simple maintenance.

• https://www.berkeleypubliclibrary.org/locations/tool-lending-library
• https://oaklandlibrary.org/otll/

Some bike shops also have public work benches with tools. https://www.boxdogbikes.com/about-1

I was going to say use the old timey fixed width typewriter fonts that the US Army Corps uses (PDF page 5 and beyond), but I guess that they’ve switched to Times New Roman.

Maybe use open source fonts like DejaVu and Liberation?