You know the problem working over pins in your pattern: all pins are
pushed into the pillow down to the head, but the threads still get
caught by them. With our "bridge" they will be conducted over them.
Just put the bridge on the pillow and over the pins.
The
advantage over the horseshoe (besides the price): it is more flexible.
You can bend it in any form your pillow or your lace requires. Because of the form of roller pillows bridges for them are a bit thicker than for flat pillows.