Don't be fooled by cheap imitations! SWB’s are the original high quality "Double-Loc" Servo Arm
Holes are threaded for 4/40
Not only designed to clamp around the output shaft, but they also make up for any inconsistencies in the output shaft sizes
Half arms are measured from the servo screw hole to the outside hole
Full arms are measured from the servo screw hole to the outside hole, 2X Example” 1-1/4 Full arms are 2-1/2” from outside hole to outside hole
Hole spacing: 1-1/2" & 2' Half arms .25 (1/4") 1-1/4", 1-1/2" and 2.25 Full arms .25 (1/4")
Offset arms are designed to be used with a rudder horn of that length and crossing the wires Example: 3” offset arm is to be used with a 3” rudder horn