for what its worth, I took a round file , broke it so it would not be tapered , put it in the drill press, put the dowel in a table vice and once I had the angle just went at it .Maybe, a 1/2" rasp would be perfect for the 3/8"dowels. The 3/8"rasp works well on the 1/4" dowels. The spindle sander would need a 1/2" round drum. I will look. Thx.
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I use a simple floating vise and get it done by handThat's a good idea. A cross slide vice?