Since most sewing machines are calibrated for medium 50-40wt threads, sometimes you’ll need to make a few adjustments so you can sew with these thick threads.
WonderFil Specialty Threads
Sue Spargo 5wt Eleganza, 160 Yard BUTTER AND SAGE for Added Dimension, Hard to Find 5wt Perle Cotton, We Stock Specialty Threads, Ships Fast
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The Ins and Outs of Thread Weight - Canadian Quilters Association/Association Canadienne de la Courtepointe
SP21 - Caramel - WonderFil Threads Japan
Fiber Antics by Veronica: May 2021