I stitched up a hammock last night and it's hanging in the back yard now. The lady at the fabric store said I might use tissue paper on either side when I hemed the ripstop, but I had no problems and I did keep a little tension on the seam as I ran it trough the machine. My stitch wasn't perfect but I didn't pin anything either. I made a couple of stuff sacks for my heine cook set while I was at it. Practice makes perfect or at least better.
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Enjoy your next trip...