Merchant & Mills - Beeswax
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Pure beeswax in a pot with a lid.
Beeswax is traditionally used by tailors to strengthen thread when hand sewing buttonholes. You can use it in modern couture sewing for hand lapped zippers.
Keep it by the sewing machine and pull your thread across it a few of times before snipping off the thread end and it will be as easy as pie to get the stiff neat end through the machine needle.