solid INSERTION_FACE
facet normal 0.0 0.0 -1.0
  outer loop
    vertex 0.25 -0.005 -0.02
    vertex 0.25 -0.045 -0.02
    vertex 0.21 -0.005 -0.02
  endloop
endfacet
facet normal 0.0 0.0 -1.0
  outer loop
    vertex 0.25 -0.045 -0.02
    vertex 0.21 -0.045 -0.02
    vertex 0.21 -0.005 -0.02
  endloop
endfacet
endsolid INSERTION_FACE