Vibration noise on my Swift

My Swift is having some vibration noise around bottom of the car especially during Air-con kick-in for the past few weeks...
The noise came out during the engine around 800+rpm
This morning I found the culprit and got it fixed for free... it is due to a loose bolt on the CAT converter to the holder.

I thought this is the culprit at first as I tried to push it with a rod and the noise is gone

This is the culprit - The bolt was loose and after tighten it... no more noise... yeah...