What about for those who pin their main gear to the shaft? I pin my stock main gear to the mainshaft on my hp05s bird (but not my c05m bird). THe hp05s/9T setup is just too powerful to pressure fit main gear onto a D-shaft. Without pinning the gear, it slips just a bit off the flat during normal flights enough to induce unnoticeable vibration yet still big enough with hp05s/9T headspeed to upset gyro and induces random 90-degree CW kick.
Sounds like for those with pinned main gear, this gear may work just fine.