Think this is my old original e-pik. Just a hair above 10mm to notch. S n S stir end to top of "plate" the tangs come out of is exactly the same. Am using a crappy ruler atm, so may be a little off. But, if I put the top of the plate right in the notch, the arm and tangs are at the same point if that makes sense.
EDIT: Duh!!! This may be easier. Am sure you know the specs on the Scoop-n-Stir.
Wow! Epik sticks out about 2mm longer than yours. I think we had a discussion about Epik lengths a while back on the nano thread. Took a poll and seemed the sizes ranged from 12mm to 17mm in length.
Still, it does work great to push the screens down in place