Excellent suggestions all.
I bought this pistol in 1982. I switched from the original BHP adjustable rear sight and put on modern fiber optic sight very similar to Dawson many years ago.
I did not replace the front sight since it didn't appear easily done:
This pistol was my aircrew carry on all my cruises and during the first GW...been with me (or under lock and key in the ship's armory) a long time so I decided to return it to original kit last year.
Oops. Can't find the originals and it has been a bear working this. The adjustable rear sight is not original spec but it was the closet I could find.
Rather than file, I think I will keep working on getting the OEM rear sight. I will call Brownell's after I find a Hi-Power technical site like Pelican and confess my sins.
Thanks again to all.