Mark above slot

Mark in bottom left corner

a

Weak mark in top left corner - no mark in top right corner

a

Mark in bottom left corner + double mark in bottom right corner (when pip is bottom right)

a

No mark in bottom right corner

No mark near center on bottom ridge

No mark on bottom ridge

Small marks between stud 1 and 3, and between 2 and 4

No marks above slot on right edge

Mark in bottom left corner

a

Mark above slot on left ridge

a

No mark near left corner on top ridge