HI! I own a National Two Spools.
The Two Spools uses the standard needles;so, no need to hunt down a special one.
Please post a photo of your machine. Folks here in the Vintage Machine Shop love to see each others vintage machines. Here is the link to the photo page:
http://www.quiltingboard.com/vintage...t130994-9.html
And here is the link to the Shop's discussion thread:
http://www.quiltingboard.com/vintage...ml#post4641284
There are a couple of us on the Vintage Machine Shop thread that own Two Spools and use them.