I know that when you're doing Celtic work with bias, you can use a wing needle to stitch both sides of the bias. I've seen it done, but you have to take your time.

What is a wing needle?

I did go in and ask about it, and it was on a pillow that was done with an embroidery disk module. Since I don't have one of the machines that uses those, I didn't ask further questions. Also, they were pretty busy that day. Now, had I been looking at getting a new machine, I would have explored it further.

A wing needle is used to make the little holes for crocheting around baby blankets and burp clothes. You can also use them in heirloom sewing to make it look like you used entreduex.

I live and learn, yes I have an unused wing needle, I am looking forward to a tip on how to use it.

I think that what you are thinking of is a double needle.

A wing needle came with oneof my machines years ago. I remember using it to try it, but that's all.

I use the wing needle quite often to make an edge around embroidered cloths before doing the crochet boder. My machine has some lovely stitches which are very effective for the wing needle when doing decorative stitching on soft furnishings like lamp shades. I also have a double needle which contains one straight and one wing needle which is used for some decorative stitching. When my triplet girls were small I used a lot of the stitching on their clothes - now I'll have to wait until one day for grand children!