Switchcraft / Conxall does mfg. Slide Switches with "Tapped Flanges" (available special order #2).
http://www.switchcraft.com/Category.aspx?Parent=654

Switchcraft 46200 Series Slide Switches, 2 Position, 1 Pole, 2 Pole : Spec Sheet
http://www.switchcraft.com/Specifica...spx?Parent=429
Standard Slide switch (larger then 1.20"). 46200 Series are 2 Position, 1 Pole, 2 Pole

SPECIAL ORDER FEATURES

1. .344 inch (8.74 mm) high knobs are standard; other heights available.
2. #6-32 and #4-40 tapped flanges for mounting available).
3. P.C. terminals.
4. Series 46000R switches are CSA marked on special order only.