Yup, tower hobbies have them for $8.49.
Should be able to get them from a few places in the uk.
Might it be worth mounting them less rigidly, as it sounds like the case tabs are the weakest link in your current set up. Maybe use the rubber mounts/bushes that come with most servos. Let the servo float around on the chassis as it flexes, rather than resisting. And cracking
|