This is a new version on an old puzzle. Invented by Sam Loyd 1841-1911. The puzzle is placed on a buttonhole and seems impossible to remove. This is where the term buttonholed (to get someone's attention) came from.
Step 1: Materials and Tools
I used para cord and some copper pipe 1/4 O.D. x 5/32 I.D.
The main thing is to pick something small enough to fit thru a buttonhole.
Something to cut the para cord. A hot knife would work best, I used the knife on the Multi-tool.
Something to fuse the ends of the para cord. I used a lighter and a candle.
Something to cut the pipe. A pipe cutter or hacksaw. I used the saw on the Multi-tool.
Something to smooth the pipe, after cutting. I used the file on the Mulit-tool and fine sandpaper.
Something to crimp (Smash) the pipe. Pliers, hammer, press, clamp whatever, not your teeth.