Turn small plastic toggle on Holster a 1/4 turn to unlock from clamp.

Using a coin or key, fully un-wind the clamp so that it is fully open - before fitting it to the tube.

Remove 2 screws from clamp with a screwdriver.

With clamp in 2 halves, place around tube then re-screw together firmly.

Fasten by turning the end of the clamp with a coin or similar until tight.

Re-attach Holster as per number 1.