This post is to complement pattern instructions for the Fennel Fanny Pack. The techniques apply to all Slide Adjusters and Side Release Buckles however.
Step 1: Install the Slide Adjuster on the long end of the webbing.
Step 2: Install the male end of the Side Release Buckle by feeding the webbing up and around the center bar of the buckle.
Step 3: Feed the webbing back through the Slide Adjuster, the same direction as the first time, underneath the existing webbing.
Step 4: Loop the webbing around the center bar of the Slide Adjuster. Fold the end in 1/2 in | 1.3 cm and sew the webbing to itself with two rows of stitching.
It should look something like this:
Step 5: Insert the short side of the webbing into the female end of the Side Release Buckle. Fold the end of the webbing in 1/2 in | 1.3 cm and sew with two lines of stitching.