I'm not saying "drill a hole through your #Baofeng" but what I am saying is, I widened the mic hole with a tiny hand drill and my voice does not sound nearly so muffled... if you do this, you could drill through your mic... which would not be good... also dust and things... and no more warranty... on your Baofeng #UV5r etc
Edit: Actually, I did this to two Baofengs and both sound better on the other end now... wind and plosives are an issue... but I side-mic anyway