For me, I'd rather not use tape, but I don't yet have a combination of seam guide and presser foot that works at 1/4" for my Morse -- since I've been using a standard zigzag foot, the seam guide would need to sit under the foot. I've been thinking of stealing the narrow straight-stitch foot from my Singer 15-91 until I pick up a quarter inch foot so I can use the screw-in guide (which is great for anything over 1/4"). In the meantime I have painter's tape on there which isn't the most attractive thing ever, but low-tack enough not to leave much residue, and luckily it doesn't actually sit on the bed of the machine since the bobbin plate is in front of the throat plate on that model rather than to the left of it.