SINGER W102 - Manual (Page 29)

NEEDLE
Always use highly polished chrome finished needles. The cost is
approximately the same and the workmanship is better.
Change needles often, for the point becomes dull and blunt due to
the many thousands of times that the needle pierces the material
when a dress or suit is being made. If you have a magnifying glass,
examine each new needle before putting it into your machine and
look for (1) sharp edges around the eye, > 2) blunted or broken point,
and (3) a bent or "fish-hook” point.^ Lay the needle on a flat
surface to be sure it is not bent or curved.
Choose the correct needle for the size of thread. If the needle is too
large the seam will appear to be a row of perforations............... or if the
needle is too small the thread will lay on top of the material and
the tension settings will appear to be incorrect. Consult the needle
and thread guide for the correct needle and thread sizes.
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