Help identifying a Consew machine

[LindanHotAir]

The Consew is a clone of the Singer 111. The thread you show is a TEX 70 also known as size 69 or 3 ply. I normally run a size 18 or 110 metric (1.1mm) for that size  or up to 92 thread. I have not run 138 in my 112 as it doesn’t seem to have enough clearance in the hook. Bobbins are size G.. The needle system most of these machines were set up for is a 135x17. Some were set up for other needle systems by adjusting the needle bar position. Groz-Beckert.com has some excellent references on needles. I use their titanium nitride coated needles as they are extremely durable and lower friction. They are branded GEBEDUR.

[chrisash]

This will help with thread size vis needle size 

https://www.tolindsewmach.com/thread-chart.html

[MarlinDave]

I run 138 thread on top, 92 on bottom, sometimes 138 maybe in bottom.