As long as they have a similar shape, and as long as the dimensions of the most inner turn is smaller than {HEAD ~ the corresponding dimensions} of {TAIL ~ the aperture}, the core can be prevented from touching the winding sheet 21  
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As long as they have a similar shape , and as long as the dimensions of the most inner turn is smaller than { HEAD ~ the corresponding dimensions } of { TAIL ~ the aperture } , the core can be prevented from touching the winding sheet 21
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH