I've been using the King Hedz bellcrank and the Tamale steering piece with TOP aluminum ackerman inserts and aluminum steering knuckles with a Kimbrough medium servo saver and a Savox 1251 servo on two different cars. I've smacked everything that stands still at least 3 times, and chased down and smacked everything that moves at least twice. Have yet to do anything other than bend the arm on the steering knuckle.