import cadquery as cq
w0=cq.Workplane('XY',origin=(0,0,-21))
r=w0.sketch().segment((-21,43),(7,35)).segment((9,42)).segment((-19,50)).close().assemble().finalize().extrude(-8).union(w0.sketch().segment((5,-44),(7,-48)).segment((7,-49)).segment((8,-49)).segment((9,-50)).segment((10,-49)).segment((21,-49)).segment((21,-45)).arc((13,-46),(5,-44)).assemble().reset().face(w0.sketch().arc((7,-5),(14,-3),(21,-5)).segment((21,0)).segment((7,0)).close().assemble()).finalize().extrude(51))