Instead of use of the waterproof cover, {TAIL ~ the axial gap} may be controlled in {HEAD ~ size} thereof 
Instead of use of the waterproof cover , { TAIL ~ the axial gap } may be controlled in { HEAD ~ size } thereof
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH