I have built 3 kids bows all of which were wood with glass back, built a adult bow (glass)for myself but trying to tune the arrow keeps swinging side to side, here is details which i have already tried first the bow is a "D" shaped riser aggressive r&d 64" 55#@28 im shooting GT 5575 28" arrow with 145 g. tip with 50g insert.my draw is 26". bare shafting the nock is laying right i have tried a lighter spine shaft red head 250 and a beman 340 with 145g tip and at 10 yrds missed whole target (bare shaft) added up to 80g in insert and seemed to have got worse. string tracks good down center of bow, arrow shelf sets about 1/8 of center. bow shoots were im looking just the movement is driving me crazy.