Does anyone here know how well birch wood performs for yoyo axles?
This Company has been around for decades…
They seem to Love Birch for its’ durability properties.
Obviously they don’t make yoyo axles; but they know a few things about wood. And Birch is their go to choice for their products.
…And they sell Birch dowels in 1/8 inch, 3/16ths and up.
Get a bag of dowels and save some cutting time, haha…
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Thanks, Doc.
Researching birch a little more, there are differences in durability in different types types of birch; yellow and sugar birch being the stronger and paper birch being the softer.
I ask because birch is virtually the only hardwood in 1/4" that I can import here to Australia, no kidding. Nothing else at all is avaliable to buy at all. I need 1/4" because that is the size of the pilot hole drilled in each half from my circle cutter. There’s some in 6mm available here, but this is .35mm thinner than 1/4 so it’s a sloppy fit.
The lack of availability of 1/4" hardwood dowel is so scarce that I’ll need to build a dowel making jig for my router table and make my own.
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They’ve worked pretty well for Tom Kuhn since 1976 or so. 
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Thanks Ed, but Ive finally been able to source some 1/4" walnut dowel.