I use Acrobat Pro 7.1.0 - Win XP SP2

I receive 2D monochrome CAD drawings from a vendor for approval. I add an "Approved" stamp and use the doc.FlattenPages() JavaScript command to make the stamp permanent. When I do this, some of the thin lines of the drawing become slightly modified/thinner and then only some of these lines will print properly. Others seem too thin to print.

Is there any way to modify the settings Acrobat uses during flattening to prevent losses or modifications of original data?

I have played a little bit with Hair-line repair but it doesn't seem to work for the circles, only straight lines. I would like to avoid making "touch-ups" as I have a lot of drawings to review.

Why not try the flatten option on the Advanced menu (I think that is where it is located). You should not have to use JavaScript. At least it is worth a try.

Besides the javascript trick, I am aware of 2 options regarding flatten in the Advanced->PDF Optimizer menu. One relates to transparency flattening and the other refers to clean-up (discard hidden layer content and flatten visible layers). As best as I can tell, neither one does anything relating to the stamp as it can still be deleted after flattening.

Granted, I am an Acrobat novice so I may not be using these tools properly.