Ron,
I thought by know you would know you can call anytime you need to with a question.We have already talked 5-6 times & went over everything with you about needles,thread,sewing thickness & etc.Yes,the Cowboy manual is Chinese that's why we sent the other one.You did get 2-manuals correct?.It is just a real basic fairly easy machine to operate not much different than the 1541S.Just able to handle thinner material better.
Here's our needle & thread chart maybe that will help?
http://www.tolindsewmach.com/thread-chart.html