Centuri Powr-Pad Launcher and Controller, Part 4, Safety Key

The continuity safety key is interesting.
A larger plastic housing holds a standard style safety key.

The Centuri name plate piece glues over the key with plastic cement.
There are two small holes at the top for a string. The key can be worn around your neck.

Here's the finished unit with the key fully installed.

I've always inserted safety keys lightly, just closing the gap between the internal plates.
To fully seat this key against the top of the blue housing, you have to press it in hard so the two brass plates are pressed down and apart.

An old Centuri favorite is the Rocket Positioning Spring.
This was the basis for the Odd'l Rockets Raise Spring.

I learned later on that the Centuri spring was a R/C airplane wheel retainer. It was pressed over wheel set onto a 1/8" wire axle.

I threaded the Centuri spring over the lower half of the launch rod. Even with the rod oiled it was nearly impossible to get the spring on the rod! It was just too tight. The Odd'l Raise springs fit easier and locks on the rod when any rocket weight is on the upper arm.

The Odd'l spring has an added brass tube on the upper arm. The tube prevents the thin wire arm from getting stuck under the engine hook.