HP card reader drive coupling

[Divasson]

I have found that this coupling's failure is a frequent problem (once solved the gummy wheel issue). In some cases it is seen as cards not being drawn; but at others, it is just enough to have small speed differences, resulting in a "MALFUNCTION" message despite passing the card.

I have used successfully E6000 glue on several samples recently (after cleaning the old material residue). Its elasticity avoids fragility, and it "sounds" nicer than normal.