I agree with J. Honeybun, you need to get the top/bottom thread tension in balance using a straight short stitch on more typical material, then switch fabric.
But if after all that and still having issues;
The middle slot in the needle plate is wide as well as long. You might try masking tape over the slot (possibly more then one layer) but the tape must be narrow enough to not interfere with the feed dogs. Then bring bobbin thread up through tape and begin sewing.
Priceless machine.... I appreciate that well used look.
I have been using a machine like this for over 40 years. The only limitation is the operator, and operator error the only problem! Whenever there is a problem, go back to basics. Is it threaded properly, especially the bobbin? Does it stitch woven cotton well? Adjust the stitch length. Finally adjust the width. All on good tempered cotton. Then, and only then, change over to stretch fabric. Do you have a manual for it?
Please elaborate on what the machine is doing exactly. Is it not picking up the bobbin thread?
In Stitches Sewing Knits Without Serger SewKnits Com
How to Sew Knit Fabrics with Complete Confidence
How to Sew Knits and Stretch Fabrics with Sewing Machine video
There are many elna machine described as Elna somthing or other SP. You might google "Elna SP videos" and find material pertinent to you.
I inlcude the geneal Elna YouTube link below just to demonstrate the large number of videos for the Elna line.
https://www.youtube.com/playlist?list=PLUoLx1i_-3C7TG7-CGFSEv9E6a0FPOg7k
SOURCE: Elna Stella TX - stretch stitches missing on stretch material
Oh yes, a ballpoint needle would indeed help.
Good luck and let me know if this solves the problem.
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