Removing rotor arm

Hola. Tried to remove my rotor arm to renew it and it seems quite firm to remove. Is there any 'clips' holding it etc or just pull it off? Cheers. Checked the cap and contacts seem a little furry. School of thought is if changing the plugs may as well do the whole system- plugs leads cap n rotor arm.
 
The rotor arm is held on by one 8mm (AFIK?) bolt through the plastic, really annoying but helpful at the same time, just turn the engine over until you find it.
 
I thought the same things, its always the opposite damn side to the one your looking at haha.
 
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