I have heard that certain, erudite Gedolim had photographic memories and passed the pin test. A volume of Talmud would be opened; a pin was thrust through its pages. The Gadol would look at the word/letter that the pin first entered into and then recite the other letters/words it hit on other pages too. Is there any source for this?
The most conservative approach to this test is that it was performed for a single daf/double sided page of Talmud. The Gadol would see which word was pierced on the revealed Amud Aleph - A side - and then reveal which word was hit on the hidden Amud Beit - B side. Any sources?