Do you have a Dremel tool ?

If so, buy 3 carbons - get a 50-60 pound shaft, start with a full length bare shaft. Shoot it with out feathers and if it flies nock right, its too stiff and you'll need to add weight to the tip to lighten the spine. It its nock left, start cutting by 1/2" or 1" lengths until you hit a length where the shafts fly really nicely - then fletch and you'll have your shafts.

Same above applie sof raluminum (get a small pipe cutter ) or wood shaft (you need taper tools)