This thread is not about cards sliding around in SGC holders because the gaskets are too thin.
This thread is not about the grading accuracy of the various TPGs.
This thread is not about resale value of the same card in various holders.
This thread is not about why you crack slabs or why you don't.
This thread is not about telling you that SGC T206 gaskets are identical, I think, to old GAI T206 gaskets, but they are.
So why in hell are you reading this?
Do you scan cards on a flat bed scanner?

or
Do you leave the top up when you scan to get a black contrasting background?

or
Are you compulsive about the appearance of your scans?

or
Do you abhor scans where cards are tilted?

or
Do you hate scans where cropping has created an apparent razor sharp edge?

or
Do you hate wasting time straightening scans to satisfy your OCD?

or
If you answered yes to the previous six questions, then you are reading the right thread.
Try placing a row of gaskets along the edge of your scanning bed. Place the raw cards against the edge of the gaskets. You may also align the cards with the opening in the gaskets, if you crop individual cards directly from the scanning bed. If scanning many cards of the same tyoe, the cards will be cropped appropriately without having to duplicate this step. Scan several cards at the same time with the top up. Note that you do not have to remove the gaskets before scanning as they are black.
Now aren't all you crackers sorry that when you cracked your slabs, you sent your gaskets to the dumpster?
You can't find useful information on this forum every day, but sometimes you just get lucky.
Confused? Here are some "Gaskets in Action" as described preceded by an example of an expedited scan using this technique. Can you tell which side of the card is a gasket border?