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Once I am sure my sashing lines up accurately. I then measured the width from the edge of one seam of batting to the opposite.
In this case it turned out to be an even 4 inches.
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I cut a 4 x 9 1/4 piece of batting giving my self a little more than necessary on the length to be trimmed later.
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Laying the batting in the sashing canal. I make sure there is no bunching of the batting. It needs to lay nicely in as if it were a puzzle piece.
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I then take large basting stitches down both sides to hold the batting from sliding.
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Now I place a very thin line of glue on the edge of my material to hold my flap in place.
I seem to have not taken a picture sewing the seam. I used my open foot so that I could clearly see where
I was sewing and I sewed from the front down the ditch line.
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When I turned it over I had a perfect machine seam..

Ah Ha... I must of done it right.
More Steps to follow in the next post.