Comp you bring up good points.
AC43-13 is "the guide" A&Ps fall back on when they can't find criteria in the manufactures manuals or get direction from engineering, or are working vintage aircraft.
Although it is used quite a bit by Mom&Pops shops and homebuilders on small propeller aircraft.
Some good information but very basic.
https://www.faa.gov/regulations_poli...cumentID/99861
Chapter 7 has the hardware.
https://www.faa.gov/documentLibrary/...Chapter_07.pdf