SRAM s350 crankarm bolt

Hi there
I have a boardman cx team with sram s350 crankset. My pf30 bearings sound rough but I can not remove crankset as the 8mm Allen key hole is worn. I have bought another sram self extracting bolt kit. But I can not undo the retaining cap? I take it this is left handed thread clockwise to undo the same way as the arrows on it? The arrow go clockwise but do not state tighten or loosen. Any tricks to remove it?
Many thanks Wayne
I have a boardman cx team with sram s350 crankset. My pf30 bearings sound rough but I can not remove crankset as the 8mm Allen key hole is worn. I have bought another sram self extracting bolt kit. But I can not undo the retaining cap? I take it this is left handed thread clockwise to undo the same way as the arrows on it? The arrow go clockwise but do not state tighten or loosen. Any tricks to remove it?
Many thanks Wayne
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