try this link for tuning http://www.bowmaker.net/index2.htm

I would also order 1/2 dozen arrows and leave them a little long.That way you can trim them down and increase the spine.If you need to weaken the spine you can shoot a heavier point.If there is a local bow shop pay em a visit.Many times they will have odd sizes of shafts laying around and you can shoot several before deciding.For a stickbow go with a arrow on the heavy side that will spine or shoot good.

CB