Originally Posted by grimbeaver
I had a HK tail not a Tarot. And it was time for it to go anyways as the vertical stabilizer mount was built into it and thus there was no pin to prevent rotation of the tail on the boom and occasionally it would twist when changing head speed.
I never found the pin in Pro/Sport tails to be all that useful as it still allows the tail to twist somewhat and you still have to tighten the screws to ridiculous amounts of torque to secure it. I always glue a 3mm wide strip of paper longitudinally to the boom where the tailcase slides over and it completely secures the tail and prevents twisting without needing to over tighten the screws.
The same idea works to keep the tailboom secure in the boom holder, I cut a strip of typing paper long enough to wrap around the boom (wrap twice for plastic holders, once for metal) and glue it on (I find that wood glue works better than CA for this but for the tailcase end you need something like CA or no mix epoxy to hold the strip on)