The main impediments to a front sight that stays put were:
The old-style narrow tenon sight.
Those ENORMOUS front sights people demanded back in the 60's and 70's.
Some of those sights were an inch long.
The main problem was, not providing for an adequate sight rivet.
The three combined to make it difficult to get a sight to stay stuck, and this led to the practice of silver brazing sights in.
This is no longer considered a valid pistolsmith technique.
Today, good pistolsmiths apply NO heat to a gun unless there is just no other choice.
Either the Brownell's or "Ordnance" tool will work fine, it's strictly personal preference.
The "trick" is to use a ball carbide cutter to grind a small "crater" or dimple in the inside of the slide on the bottom of the sight tenon cut.
Grind the excess length off the tenon leaving plenty to rivet.
Rivet the tenon in place. The "crater" inside the slide gives the tenon rivet room to flow and provide plenty of metal to hold the sight.
You want the rivet to fill the "crater".
Where the old timers failed was in just riveting the tenon.
When the excess was ground off to clear the bushing, most of the rivet was ground off too, leaving not enough to hold the sight.
Large sights plus a tenon rivet that was mostly ground right back off resulted in sights flying off or becoming loose.
When the "crater" is cut first, the tenon rivet flows down into it.
When the excess is ground off, there's still plenty left to positively lock the sight in place.
That, plus the newer, smaller, more reasonable sized sights means a sight installation that will stay in place without resorting to silver braze, refinishes, and possible heat treat damage.
As dumb as it sounds, that little dimple or crater was the whole secret the entire time.
No dimple, not enough rivet left, sight won't stay put.