Not true, Ball links have been made in different sizes for ages. One of my friends got tired of his 410's cups popping off and went with Ball links and hasn't had an issue since. Using Ball links removes all slop because they get torqued down and there is just about no play.

http://www3.towerhobbies.com/cgi-bin...k+++&search=Go



here is my 25+year old RC10 with 25 year old Ball Links:





As you can see they are no more bulky or bigger than regular ball cups. The ones on the rear are the heavy duty ones and even then, they's just a tad thicker all around.