import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-1,0))
r=w0.workplane(offset=-22/2).cylinder(22,22).union(w0.sketch().segment((-50,-31),(-21,-31)).arc((0,-38),(21,-31)).segment((50,-31)).segment((50,31)).segment((21,31)).arc((0,38),(-21,31)).segment((-50,31)).close().assemble().rect(86,54,mode='s').finalize().extrude(25))