I've done it a number of times (about 4). I got an almighty bang when it went in. Still seems to be fine. I just don't do wheelstands anymore. Because of this I usually shortshift into second now rather than winding it out in first. It seems to happen when I change into second at high revs. ...and yes, I did positive changes. No damage at all from what I can tell after about 10,000 Kms, but I don't want it to happen again.