I got the 4500, If I go around like sewing a reinforcement piece, I usually overlap my stitching by 3 or 4 stitches. on the pancakes, like on the picture, by the belt loops, I mostly never start and finish on the same place. I start on the bottom of the holster about 5 stitches from when I am turning up aling the first stitch line. That way, I have about 3 or 4 stitched to go over on my second pass (this will lock my begining stitch line. Then at my stopping point, I'll reverse my machine and do 3 or 4 back stitches. does that makes sence?