Originally Posted by
PatriceJ
switch to a 60wt thread in your bobbin.
80wt would be better.
using the invisible thread in the bobbin would be best.
No one recommends using "invisible" thread in the bobbin. Do so at your own risk.
Normally the top tension is reduced about half when using Mono-Poly. No need to change the bobbin tension if it's sewing fine otherwise with other threads.