Thread: 15-91 machine information
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Old 09-27-2011, 02:13 PM
  #4  
Lostn51
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Join Date: Oct 2009
Location: Bikini Bottom
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If it is the one I am thinking about it allows you to be able to disassemble and assemble the stitch length regulator. I use it to be able to oil the area and make sure the parts are free from grime and functioning properly.

Billy
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