arm 40 of fig1 f referring to fig1 f and 1g a flat gasket formed of material such as but not limited to rubber and plastic can be shaped to conform to the perimeter shape of hear shaped blade mounting portion 41 allowing the blade 10 to be more tightly attached to mounting arm 40 fig2 a is an exploded view 100 of a second preferred embodiment of the detachable blade 110 mounting arm 140 and cover cap 160 fig2 b is a bottom view of the second preferred embodiment 100 of fig2 a fig2 c is a perspective view of the upper surface 161 of the cover cap 160 used in fig2 a 2b fig2 d is a cross sectional view of an assembled embodiment 100 of fig2 a along the direction of arrow c 3 referring to fig2 a 2d embodiment 100 includes planar shaped ceiling fan blade 110 having three keyhole slots arranged in a triangular pattern through the wide planar portion 111 of the blade 110 each keyhole slot includes a wide diameter bases 113 115 117 and a narrow longitudinal portions 112 114 116 respectively mounting arm 140 includes a flat generally paddle shaped blade mounting portion 141 having an outer wider end 144 and a narrower region 145 connecting to a curved narrow connecting arm portion 146 flat headed fasteners with stems such as those described in the previous embodiment 122 124 126 are arranged in a.