Fix #4080 - fixed extrusion bug (#4085)
Fix #4080 - fixed extrusion bug (#4085)

* Fix #4080 - fixed extrusion bug

* #4080 - center coils on poles

Co-authored-by: mkeilman <27f9cd1e113e9d2b85b316f662971e5749820fe4@radiasoft.net>
radiasoft/sirepo,radiasoft/sirepo,radiasoft/sirepo,radiasoft/sirepo,radiasoft/sirepo