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Tunned Windage Compensator. Tuned Windage CompensatorTM (TWC) Replace your windage knob with a TWC knob calibrated in yardage increments based on a 10 M.P.H. crosswind. Adjustable for any crosswind speed (2 - 20 M.P.H.) and angle of crosswind (15ﾰ- 90ﾰ degree crosswind). Windage knob will match selected elevation knob yardage format. TTC #1.......................$109.95 TTC #2.......................$109.95 Example of a TWC (1/4 MOA clicks) calibrated for 308 175 gr. Match; Right or Left 10mph crosswind compensation out to 1000 yards; 5mph crosswind at 400 yards = dial in 200 yards. 45 degree (3/4 value) 10mph crosswind at 400 yards = dial in 300 yards.