More to explore:
Hem Clips with built in measuring
Button Hair Clips
Hammer Screwdriver Combination Tool by Schoolhouse Electric & Supply Co.
Alphabet cookie cutters. In stainless steel from Muji.
Use a clothes pin to hold a nail for hammering.no more squished fingers
How to hem jeans.
These illuminating crayons.
The Kenneth King Hem - another fabulous technique for a tiny hem.