On the IB-7 Floyd rose style tremelo, whenever i use it , it makes a creaking noise, I think it could maybe be the bit where it connects to the poles where it is screwed between.(where the unit is put on so the 2 screws and two things you had to hammer in to the guitar) So it think it creaks when going across that or something. If so how could i fix it.. or is there any other reason for it to be creaking?