Glue gun with glue sticks or E6000
Play with your marbles and acorn caps to see which acorn caps will fit a marble. Not all acorn caps will work.
Cut as many 26″ to 32″ sections of hemp cord as you need for the number of acorn caps and marbles that you have paired together.
Drill two holes into the acorn cap on either side of the stem, or where the stem was.
Thread hemp cord through holes in the acorn cap and tie together.
Use a glue gun to place a dollop of glue inside the acorn cap and quickly place a marble into it before the glue dries.
Courtesy of rhythmsofplay.com