[CadRhino]

I have a question on what would be the best approach to face mill over a 1018 steel part that has a broken HSS tap in it. The part is .7" wide.
I am making a drilling jig and broke a HSS 1/4"-20 hand tap in the top. See photo attached.
I would to take the top of this part down another 1/2" and that would require taking the imbedded broken tap down as well since it is thoroughly imbedded.
If I use an old 1/2" HSS end mill to do this, would it work or would I completely trash the endmill? I have an old 1/2" endmill that I would use. Surface just needs to be flat but not precision like the rest of the part.
I also have a Tormach center cut insert end mill I could use but don't want to trash my good inserts unless they would survive the operation.
Any thoughts would be appreciated.
Thanks!