Customized version of http://www.thingiverse.com/thing:56910

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=56910

Using the following options:

_interiorHeight = 15
_resolution = 120
_part = base
_bayonetDepth = 0.4
_style = round thin
_minimumWallThickness = 1.0
_lipHeight = 4
_insideDiameter = 26
_numberOfSides = 9
_topBottomThickness = 1.0
_partGap = 0.2