MIMF

Hi im looking for an online source for graphite stiffeners,rod and thin sheet stock.anyone have a good source other than stewmac and LMI, for small quantity purchases?

Allred.com aka dragonplate.com You want the "pultruded" rectangular sections.

I've used Rock west composites
They have CF and a
flax cloth I used as a sandwich (cherry/flax/cherry) for the back of an archtop it is too stiff. The next time I'll omit the inner 1mm of cherry.
They also have many shapes of cf tubes.

I also recommend the Dragon Plate composites.

Eldon, I read your post, and since I had never heard of flax cloth, I checked out the Rock West web site. Very interesting. I would really love to see pictures of the back of the archtop you made with the flax cloth. In addition, the web site notes that flax cloth is vibration damping. I thought carbon fiber was not vibration damping, so I am just curious about how it affected the sound of your guitar. Looks cool though.

Too many things going on in this guitar to attribute one to another.
The back plate has a bell/glass like tap tone as you tap, but very long.
I’ve only tried it sandwich between two 1mm layers of cherry.
It seems a little stiff in the recurve area, that may be due to fact that the plate is a constant thickness even in the recurve.
In addition, the top uses a nomex core. You can see it in the double top arch top thread.
It’s a little louder than my Taylor 314 Koa and other luthier guitars I have. I think due to sound hold placement and double top.
Also, it has low tension with low break angles at the zero fret and bridge.
I can adjust the tail piece lower to increase the break angle.

To address the original post; I too have just purchased from Dragon Plate.
Quick service and delivery.
When I got the product I measured it with my digital caliper. It was within .001 of advertised measurements.
I got the link from David King.

Just to confuse things further, Aircraft Spruce sells the woven flax composite.

Eldon's guitar is pretty cool, I played it and was pleased. I can hear the influence of the CF in it. It seemed quite loud.

Goodwind Kites. https://goodwinds.com/ for carbon fiber flats for neck stiffeners. Inexpensive with cheap shipping to the states but expensive shipping to Canada. Great prices on fiberglass rods for go-bars as well.
Bob