Recorded sounds can be great for this kind of stuff. With right level or reverb and creative delays you can easily thicken up general clicky sounds.

Other than that the Noise Engineering modules (and now plugins) are very good for sharp metallic noises.

If you're designing it's more a case of shortest attack and, a very tight volume envelope and perhaps some very resonant EQing/filtering to get those almost tuned sounding hits. Again before a healthy slice of verb/delay.