«  Attention to the sound »

Hello, I just bought the pedal gibraltar GCP Cajon. The system is really nice but unfortunately when the sound of the cajon with low micro inside it is a disaster. How to avoid hearing the noise of the spring and cable system is connected to the hammer, I tried to isolate the metal system that secures the cajon but alas to no avail. How?
Thank you for your answers.
musically, koko.