Wow. I just watched the installation directions.
https://www.goacousticaudio.com/shs_install_animated
That is the most thorough set of instructions I've ever seen. You even include a a tool to keep the endpin from rotating when tightening the washer and nut. I've been using a #4 or #6 nail for years on pickup installs. Even the discussion out leaving 0.1" short on the large diameter of the endpin jack. That's a circumstance I found out myself the
hard way several years ago. I've never seen it described so well before.
The rest of it looks thorough and easy to follow. The graphics are terrific. Amazingly well done. Good work.