As a preventive and/or repair I like using very small brass rod.

I use the 1/32 K&S #8160 rod. It is easy to press into place and secure with super glue.

You might not think so, but this goes a country mile in adding strength and helping prevent breaking.
It also works well with repairs. Once the body is glued back from the break, try adding this.
Just a tip for anyone needing repair or preventive maintenance.