Same, when main gear slips down it'll vibrate badly on power up.
Originally Posted by Number1BSArtist
Yes, I get them as well. What has been said about the feathering shaft is most likely correct.
In addition to this, I've found that when mine shakes after I crash, sometimes it's because there is just the tiniest amount of play in my Main Gear/Main Shaft.
I just gently push the gear back up to take up the play and the vibe goes away.