Old Lady Adler 467 373 Thread Problem

[LeoWe]

Hello, I’ve received an old lady. She spent 10 years in a basement. It’s an Adler 467-373 that comes from an upholstery shop.

My problem is that it frays the upper thread, and I think the timing is off.

I cannot find the screw on the shaft to loosen the hook on this model.

I’m sure you can help me. I’ve attached a few pics. 
 

thank you 

Leo 

 

[LeoWe]

So cleaned her and tried to set the hook timing right. Now she stitches on paper but if I try thin leather after a few stitches the upper thread gets splittet . The needle is new .

 

 

[AlZilla]

Is the needle the right size for the thread?

There's a chart here:

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