Uni,

Here's a pic from my bad drive where the glass fell off and chipped:

/monthly_06_2015/post-2105-0-16877000-1433729286.jpg">View attachment 6649

aplmak,

I know what you mean but you are not replacing capacitors, as an example.  You are in a highly sensitive area and there is a possibility of breaking the drive.  In my opinion, I wouldn't do it (and haven't).