Old 06-16-2011, 05:27 AM
  #7  
ckcowl
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Join Date: Feb 2009
Location: Northern Michigan
Posts: 12,861
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the normal recommendation is:
with every new project -- OR--
after every 8 hours of sewing time.

a dull needle causes uneven and skipped stitches... if you are having either of these problems it is over due time for a needle change.
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