Moving rear sight in pistol

[Sid]

Is there some inexpensive tool I can get to move the rear sight in my CZ 75? I would rather not use a punch since I only need a very fine adjustment. TIA

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[Sunray]

Not exactly inexpensive, but Brownell's sells a sight mover. $60.95.
FRONT SIGHT PUSHER at Brownells

[Oyaji]

Well short of a sight pusher, what you can do is tap the sight over with a nylon or brass punch. Make sure you scribe where the sight is now with a "witness mark." This will provide you with a reference point (i.e. datum line) from which to take your measurements.