On 08/10/2015 7:45 PM, Papa3 wrote:
Laugh all you want. The square hole allows me to retract the Yaw String during high speed flight, resulting in significant drag reduction. I hear that the Mark V Yaw String includes "Speed Sense"TM Technology out of the box for this very purpose. At least, that's what I heard from a guy who knows a guys who....

P3

I simply installed mine on the inside of the canopy, this offered the
best drag reduction possible. It also works as a rudimentary turn and
bank indicator - shh, don't tell the C/D or the R/C...