I came across this method when preparing for the Caswell Quilt. I works perfect for me even if I dont use the original tools. A small pickle fork and the pointed end of a crochet hook are doing the job.
I have never been able to make such accurate shapes with any other method and its very fast.
Fusible and Glue wash out perfectly after finishiing a block. There is only one downpoint: I need at least one gluestick $2 per block..............25 blocks to go