![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhjgcV4fZP0LoFyNj9N_pJPi6tyNdIp-tntmEn6PhnbWEnwctioUqVYAzQIft-FxqWIgBhg2R1MJTIzzLLwVEJwLb0Ongn4lBBjTDWygLTzJGgLzpJMBDkXN74NUZ30SfVpJDE4yyYXL58/s320/slug+tuner-smaller-still.png)
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An iron core could be used but for RF the brass has less loss and gives an increase in frequency as you screw it in.
EDIT:
This post explains the effect of the brass slug
.spacing-coil-from-chassis-or-shield
EDIT2:
This one is same concept with a different support and pictures of the construction.
Adjustable coil
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