if you click on the word "download" in my earlier post, you will be able to save the .pdf file to your computer. it includes a picture of the block, rotary cutting instructions, a piecing diagram, and one template for 3" HSTs.
if you follow the link tim gave to bellaonline, the .pdf files will give what you need to easily make HSTs anywhere from 1" to 4".
this file is the same as the one i posted above, but it's been compressed to download faster.