There are many ways to do what you want, yet when you have FMX.
I'd get rid of that line in the hole, and place a datum axis there instead. FMX Move can move datums along with the geometry. Also FMX Mirror can mirror datums, which is pretty good.
For starters it's best to watch these:
http://www.ptc.com/appserver/wcms/events/online.jsp?&im_dbkey=158918&icg_dbkey=142
http://www.ptc.com/appserver/wcms/events/online.jsp?&im_dbkey=158975&icg_dbkey=142