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Help finding bobbin carriage for Necchi 840-100 (~Pfaff 335~)


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Hello! I finally found a reasonable sounding deal on a cylinder arm machine. When I went to pick it up the small parts that were pictured in the sale: Bobbin case, bobbin cover and presser foot, had all been lost. I had already paid for the machine and driven there so I took it home with me. 

I haven't found much info on the Necchi 840-100. Based on this thread on the very similar Pfaff 335, I ordered some cheap bobbins and cases online
They don't fit. The center hole for the bobbin case is slightly too snug to fit onto the center pin on the Necchi. 

The bobbin post on my rotary hook measures 4.4 outer diameter.

These bobbin cases measure 4.3mm inner diameter.

Could this be a matter of polishing the (cheapo) bobbin cases a bit further open so they fit? 

Anybody have advice, or know of a solid parts source for the Necchi 840?

 

Necci-840-bobbin-a.jpg

Necci-840-bobbin-b.jpg

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