Start by rotaring the spiral 1-2 rounds onto the hose / hose bundle (if spiral is long it is better to start from the middle).

Lift the spiral on top of the pin, the pin towards the mounting direction. Holding spring follows the hose. Turn the tool by its handle.

Genle Spiral installation tool is designed to make the mounting of the spiral on the hose easier.
There are two sizes available:

Spirals diameter (12) 20 – 50mm -> small tool
Spirals diameter 63 – 140mm -> big tool

Installation

Start by rotating the spiral 1-2 rounds onto the hose / hose bundle. 
If the spiral is long it is better to start from the middle. Lift the spiral on top of the pin,
the pin towards the mounting direction. Holding spring follows the hose.
Turn the tool by its handle.