read this thread [link]http://www.rcuniverse.com/forum/m_3131294/mpage_1/key_/tm.htm[/link]
And maybe refference sme pictures here....[link]http://www.bladecprepair.com/man_bh_upgrade.html[/link]

Then check your head suteup....top to bottom you find something out of whack, mixing arms are backwards...loose main shaft retaining collar...paddle pitch...something...