Where can I get a free downloadable manual for the Necchi 3101 FA?

This may be helpful. Most machines thread similarly.

How to Thread Necchi Sewing Machine

or you can search for:
Make Model manual

and get a manual for your machine. I didn't find any free, but $7 or $10 isn't a bad price.,

Not avlb for free:

Necchi 575 FA 574 FB Sewing Machine Threading Diagram

Instruction Manual Necchi 575FA

If you have your computer set up to use Adobe Acrobat, you may be able to download the document directly to PDF format.

Yes, some manuals are free.

...

Search the internet for:

Necchi 3101FA Manual

Sometimes you can get lucky to find one for free.
...

try these 2 links for a manual, it should have the information in it you need. you can choose which place to buy the manual from.
Necchi 3101 FA 3102 FB Instruction Manual
Necchi 3101FA Parts

try this link for a manual and the information should be in it Necchi 3101 FA 3102 FB Instruction Manual

here are 2 links for a manual for the machine,,you can choose where
to buy the manual from
http://www.sewingpartsonline.com/instruction-manual-necchi-3101.aspx

http://sewusa.com/Sewing_Machine_Manuals/Necchi_Manuals/3101FA_3102FB_Instruction_Manual.htm

Can I get that diagram too? And do you have a link to the spring you purchased?

Howdy. I was able to find a website and a phone number for you: allyint.com
is the site of the sole US importer of the Necchi machines. they have the manuals and accessories available for your model 3101. Their number is: 1 800 525 9987 ex 20

I sure hope this helps:)

This site (www.sewusa.com) sells manuals for many types of sewing machines. It also has a section (on left side of home page) that provides basic information about treading (bobbins too) and repair.

I also own a 525 FA and just read that someone considers it is a piece of junk. I'm having problems with the tread breaking constantly (with many hours spent on this problem) and I even have a manual! Perhaps it is a piece of junk?

Good luck!

Marla