For diagrams any of these images could just be put on a simple plane.

https://www.google.com/search?hl=en&q=acupuncture&gs_sm=c&gs_upl=1080l4060l0l6643l5l5l0l0l0l0l249l865l1.3.1l5l0&bav=on.2,or.r_gc.r_pw.r_cp.,cf.osb&biw=1411&bih=978&wrapid=tlif132611429823110&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&ei=C-YKT82TLIeXtwe1vf2LBg

And couldn't a pin be easily made from two basic primitives? All you need is a cylinder and a ball, right?

 

Way too many people take way too many things way too seriously.