Made a new jig to fabricate the spring for the parking brake valve. Made a new spring using stainless steel spring wire, .0625" and Stainless Steel washers. The new spring look and operates much better than the first proto type. Made the two aluminum tube connections between the elbow and the valve. Looks like I'll need to make a few modifications to the stiffner under the baggage floor as the bulk head nut contacts the stiffner. Additionally the ability to tighten the flair nut on the valve is impeaded by the angle attached to the F866B bulk head.
