It is worth using QS material IMO. It will change less across the width,
which is critical, with the seasons. Depth of the runner is less important
and seasonal changes won't matter. I like White Oak or Maple. I don't
think Red Oak is as good as a slider, but haven't really tried it. My best
tip is, make a bunch of runners to fit your slots while you are at it. Only
takes a few minutes extra and you will find a use for them on other sleds.
For making the runners out of wood, is there a preference for how the runner
cross section is oriented when cutting from s4s flat sawn lumber. Should the
3/4 width of the runner be from the 3/4 thickness of the stock, or from the
width of the stock then sized to 3/8 from there? Or does it really matter?
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