Noise and Loose Belts?

[photocycler]

So I have about 6 solid packs through my 500, I noticed the belt is starting to loosen a little. Went to move the motor mount and tighten the bolt and seems one of the motor mount screws are stripped (spinning). looks like I will need a new mount eventually , its folding fine now

So I did notice what could be the sound of rattling when flying, all bolts check out, is this a sign of the belt being too loose?

Heli is flying great, just wondering what the noise could be

[crickr1]

Could be the belt slapping in the tube, tighten the back half of belt at the boom mount not the motor. You adjust the belt in 2 locations not just 1.