In a previous post I said that I was going to replace the crank-set on my MTB. While I was doing that and for no other reason than looks, I also wanted to swap the black end caps with red ones. I got the non-drive side one removed and the new one fitted with no problem. The drive-side was not so straightforward. I downloaded the instructions, read them carefully and went to remove the original cap. The instructions are to loosen the cap in a clockwise direction but as you can see from the picture below, the cap seems to indicate otherwise.

I finally worked out that the directional arrows on the cap are not for the cap itself but for the hex bolt which it covers and tightens up the crank on to the axle!