The Redfield 102-K is a very convenient sight. The elevation slide can be quickly raised to allow Krag bolt removal for cleaning.
The set-screw allows accurate return to 'sighted-in' elevation setting.
The 102-K holds its elevation and windage adjustments well.
The screw-slots are sized to allow use of coins as a screwdriver.

IMHO - The 102-K is a great sight for Hunting and Shooting, especially at 50 and 100 yard ranges. You can use screw-in apertures or not, depending on conditions.

I sight-in rifles by shooting a group, adjust sight, shoot another group, adjust, get group centered, and record results, (load, range & sight-setting for use at future shooting sessions).

I am conservative in making sight adjustments and avoid: taking a shot, adjusting sight, taking a shot, adjusting sight, taking a shot ....

I have worked a lot of Shooting Club 'Sight-In Days' and notice a lot of ammo wasted by shooters, who make sight and scope adjustments after each shot.

The Redfield 70-K sights, with Hunter or Target knobs, are nicely made sights. They lack a 'Quick Elevation-Slide Release', which complicates bolt removal on a Krag.
Probably the easiest solution is to remove the entire receiver-sight from the Krag for cleaning.

"You pays your money and you votes your choice".