Take off the tail cap inside you will see two holes,this is the retaining ring that holds the switch securely.
Undo this the switch should come out with it,now there will be a second ring "plastic" undo this and the boot can be changed.Just be careful to tighten everything back up and there you go
[edited] If you wondering what tool to use,i use long nose pliers like these.
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It is just a spare :thumbsup:
Hi There,
Here is a link to a video done by Fenix that shows how to change the switch in a TK10, I would think it would be very similar if you want to watch something for a reference:
http://uk.youtube.com/watch?v=DcXpsSCO9J4&feature=related