Shimming the tang sight has its limitations, as stated by my erstwhile companion. Worth a shot though. Put it under the right side of the base to move impact to the left. Be aware that you won't be moving the sight in a linear direction, rather in a slight arc as you tilt it. Elevation will have to be fiddled with too when shimming. It can be a frustrating venture, if fine pinpoint tuning is the goal.
Assuming a blade front sight that's non-windage adjustable, you can gently tweak (bend) it also but that's a troubling solution and would bug me every time I looked at it. Still in all though, form follows function, no?
Best bet: Lyman 30 1/2 or 29 1/2, or Lyman 103 (if your last name is on a Swiss bank account).
I thought mid-20's G's had front sights dovetailed into a ramp?
