1/4” marked washi tape-Diagonal Seam Tape
 

I just ordered a few rolls of this-one for me, and a few to share. It looks very easy to use. My old Perfect Angles is getting pretty beat up. Not affiliated in any way with this.....

https://cluckclucksewshop.com/produc...onal-seam-tape

interesting, but the recommendation is to remove it with each project to prevent residue on the machine bed

I always remove my Angler each day anyway-i use blue painters tape to attach it, but i don’t want any residue. I will only use this for HST...hate drawing those lines!

I ordered mine about a month ago, two rolls at a time... it arrived quickly. It may take me forever to use it all up.

I used painter's tape a couple of years ago. Still there, still works.

I use a ruler and ruler foot to sew HST from a square. Place the ruler diagonally across the square and the stitch line will be 1/4" away. Just make a few test pieces to check you are getting the 1/4" seam that you want before you start.

If I'm in a rush, I've been known to use a small cutting ruler against the normal foot. Checking the needle position before I start. There are no issue with the foot jumping onto the ruler if you go steadily.