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