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Old 01-28-2013, 03:11 PM
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It is made that way because that leather welt is heavy, and on an inside corner if the welt just had straight cuts, it could overlap itself and make a bulge. This way you can sew it to an inside corner or an outside corner and it won't overlap itself. That was sewn on a dedicated machine that sewed the welt and had a cutter to make those round notches. There are all kinds of dedicated machines in a sewing plant that only do one operation. The parts of your Cadillac seat from that long ago would probably have had the edges of the seat parts run through a serger which would have cut off some of the fabric and made an overlock stitch on the outside edges as it sewed the leather to the sew foam underneath.

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Last edited by DanTwoLakes; 01-28-2013 at 03:20 PM.
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