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