Customized version of http://www.thingiverse.com/thing:186482

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=186482

Using the following options:

width = 40
neckHeight = 20
bigPinLoc = 1.5
neckWidth = 10
bigPinCircle = 5
smallPinLoc = 3
openingHeight = 15
thickness = 2
frameWidth = 5
gripLength = 92
gripWidth = 9
smallPinCircle = 2.5