Rick,
Not having done this myself, but someone may chime in with a similar response with experience to back it up:
Replace the front sight with a taller one that you can then file down to regulate. Perhaps your local smith can perform that task.
I am still waiting on that DR myself since reading 'Something of Value' when I was 13.
Best of luck, Lou M.

If it weren't for the wonder of electricity, you'd be reading this post by candle light!