u/NERencsetlen

Hi everyone, thanks for the previous advices. I have an update and a very specific question for the Necchi experts.

My previous post: https://www.reddit.com/r/vintagesewing/s/TVtzJ9gakg

After more cleaning and oiling (which didn't fix it), I looked closer at the drop-feed linkage inside the arm. I noticed a metal "jaw" / bracket (which seems to hold a lubrication felt) sitting on a shaft. This part is quite loose and slides along the shaft.

I discovered that if I manually push this "jaw" back into its original position and hold it there, the mechanism works perfectly. The feed dogs snap back up instantly after half a rotation of the handwheel, no "sweet spot" or manual nudging required!

I tried to tighten this part on the shaft.

However if I tighten it enough to stay put, the whole mechanism becomes so stiff that I can’t even switch to embroidery mode (the dial turns but it can't be pressed down).

If I loosen it just enough for the dial to work, the part becomes loose again, slides out of alignment, and the feed dogs stop returning. (But it still works if I align it with a sweet spot)

It seems I can't find the balance between "aligned and functional" and "loose and failing."

My Questions for Necchi owners:

Is this specific part supposed to be held in place by a specific clip, spacer, or a very precise torque on a set screw?

For those with a working Supernova: Does your feed dog return instantly when you switch back to sewing mode, or is there a specific "timing" or "sweet spot" in the rotation where it's supposed to click back?

Is it possible that a spring inside this "jaw" assembly is fatigued or installed incorrectly, causing it to drift on the shaft?