Customized version of https://www.thingiverse.com/thing:584352

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=584352

Using the following options:

splineCount = 20
splineWidth = 1
splineDepth = 5.5
splineThickness = 3.5
wallThickness = 2
insideDiameter = 23
spannerSize = 34
spannerDepth = 15
spannerSides = 4