Rev counter sound, maybe

Yeh where the bolt is on the side of the mount the bit around bolt, its like hooked onto the mount
 
Hmmm, still not sure what you mean, I had a look at mine, here is a picture of it...

Don't see what you mean by a cover or understand what bit could be loose...

r-ts7Ipbc0oPkuj-0Bvk-TmY9WHHwtxygV_EXPkp9MU_zps88de5eac.jpg