The following script example enables you to create a Construction Line using cylindrical faces and the axis to rotation (parallel to global Y) about those faces. This is essentially an abstraction of a bolt.

# From a selection of cylindrical faces, create construction line on the cylinder's axis

curSel=ExtAPI.SelectionManager.CurrentSelection
construction_geometry = Model.ConstructionGeometry
if construction_geometry == None:
    construction_geometry = Model.AddConstructionGeometry()

for faceId in curSel.Ids:
    print faceId
    face=ExtAPI.DataModel.GeoData.GeoEntityById(faceId)
    if face.Type != GeoCellTypeEnum.GeoFace:
        continue;

    if face.SurfaceType != GeoSurfaceTypeEnum.GeoSurfaceCylinder:
        continue;

    mid1=face.Edges[0].Centroid
    mid2=face.Edges[1].Centroid
    construction_line = construction_geometry.AddConstructionLine()
    [global_points_1] = construction_line.CreatePoints([mid1])
    [global_points_2] = construction_line.CreatePoints([mid2])
    edge_collection = construction_line.CreateStraightLines([global_points_1, global_points_2], [(0, 1)])

    with Transaction():
        construction_line.AddToGeometry()