How to Use Twin Needles?

Review      *****

* Can sew all kind of the fabric, such as knit, cotton,
 stretchy fabric,...(according to the kinds of the twin needles)
* Sewing hems on knits.

Other Tips

To prevent tangled, and avoid breaking needles:

* Keep the spools in different places.
* Thread each spool separated.
(Don't thread both of the thread at the same time.)
These tips apply for using cheap threads