This is a collection of Solid Works API Code which I have deciphered. No warranty is expressed as to the quality of the code, nor the accuracy.

<h2> Sketches</h2>

Inserts a Circle
‘Point 1 is circle centre, Point 2 is on the radius
‘ Part.CreateCircle p1x, p1y, unknown, p2x, p2y, unknown

Part.Insert3DSketch
Part.ClearSelection2 True
Part.CreateCircle 0, 0, 0, 0.01, 0#, 0#
‘Part.ClearSelection2 True
Part.InsertSketch2 True

Extrudes a Circle

‘Extrudes a circle
boolstatus = Part.Extension.SelectByID(”Sketch2?, “SKETCH”, 0.3, 0.3, 0.3, False, 0, Nothing)
‘Part.FeatureManager.FeatureExtrusion True, False, True, 0, 0, extrusion length, 0, False, False, False, False, 0.01745329251994, 0.01745329251994, False, False, False, False, 0,0,0
Part.FeatureManager.FeatureExtrusion True, False, True, 0, 0, 0.6, 0, False, False, False, False, 0.01745329251994, 0.01745329251994, False, False, False, False, 1, 1, 1
Part.SelectionManager.EnableContourSelection = 0