Put on your headphones on in the following way.
The box includes 2 adapters of different sizes (small and large) for both the rubber adapter and the adjustable support.
Your SPC Stork earphone comes with the adapter and size M support. Set up your earphone with the size of adapter and support that best suits your ear.
Place the adapters so that they are not loose or crooked.
Do not tighten the end of the adapter when removing it.