Diy Rack Case . _ 215x aluminum rivet d4x10 mm (80 for the bonnet, 135 for the base). I'll tell you how to cut and prepar. Guitar case rack GretschTalk Forum from www.gretsch-talk.com Separate them into two groups, such that each group contains one 1½” piece, one 3½”, and one 5½” piece. The one on the back will be more for stability reasons. Four caster wheels keep this sturdy diy easily movable, so it’s a guarantee that this piece is usable in any apartment or rented space.