Kitsie

Hold corner and press without burning fingies! Pictures #3 & #4

Now you can trim off the rectangle’s corner if you want! I leave them on for stability unless square is white and base will show through. Extra bulk doesn't seem to matter.

Now do second side, flip over and square up! Picture #5, #6 & #7:
NOW trim if you want!

Now to do it without marking:

Have a line (I use tape, red at the scant 1/4", green lined up with the needle) on the bed of your machine. Prepare your "goose": Pictures #8:

At the machine line up the start of the piece just to the left of the needle (I've taken off the foot so you can see this.) with the end point just to the left of the green tape.

Go ahead and sew making sure the ending point stays just to the left of the tape. Chain on another one and you're off!

I know it take a little more fabric but the result are worth the extra buck or two when you are starting. When you gain confidence and are more comfortable there are many other methods out there.

Any questions? Contact me by PM.