If you have a kayfun V3.1, and want to mount dual coil, using the "screw holes for alternate mounting coil" is very practical.
-kayfun V3.1 is more comfortable for dual coil, because it has alternative screw holes.
-If you have kayfun Lite you have no such a chance. There is no additional screw holes in Kayfun Lite.
-Russian has screw holes like Kayfun 3.1
-Russian 91% has only one screw hole. (I dont know why, and what is its function)
-kayfun V3.1 is more comfortable for dual coil, because it has alternative screw holes.
-If you have kayfun Lite you have no such a chance. There is no additional screw holes in Kayfun Lite.
-Russian has screw holes like Kayfun 3.1
-Russian 91% has only one screw hole. (I dont know why, and what is its function)
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