TPG Bent Coin Tolerance

Is there a TPG tolerance/measurement for determining if a coin is bent?

Do the TPGs use some form of tool for determining this, or just an eyeball test?

Just curious as over the years I've seen TPG holdered bent coins. However, most you cannot actually tell that they are bent.

In the example below, to me it looks like something hit this coin hard flattening the devices in the area circled and bending it in the process. Or maybe someone was trying to fix a bend and hammered on it flattening the devices. Who knows.

Any and all feedback on this topic would be appreciated.

Thanks,
Adam




Edit: added the full slab photos