Looks very time consuming and hard to use. I put a piece of painters tape at the 1/4" mark on the throat plate and ran the tape all the way to the front of my machine. I line up the diagonal corners of my square with the edge of the tape and sew. The tape stays in place all the time and I've done HSTs of all sizes using the same tape marking.

Connecting Threads has the same ruler on sale right now: http://www.connectingthreads.com/too...I__D81053.html

Of course it's on sale now since I purchased mine from Amazon and paid $4.19 for it. Plus shipping!!!!!

I've seen these rulers at JoAnn's

I''m with you Doggramma!

Try here.https://www.anniescatalog.com/detail.html?prod_id=95301