Rattletrap the Clockwerk Goblin a quick guide

Overview

Rattletrap is a strong initiator. His job is to Hookshot in and quickly isolate a key enemy with Cogs, in order to give his team an advantage in the ensuing fight. His major problem are bad stats - Clock needs some items to work well and he relies heavily on his team to finish heroes off lategame.

Consider getting the 1st level of Power Cogs at 2 if you are sharing a lane with an ally. You can open holes in your own Cogs by attacking them.

Rocket Flare is extremely versatile:
Spam it whenever you are at the fountain. In the start, this can help identify the enemy lanes.
Use it to scout runes.
Use it to last hit against a tough lane
Target a lane across the map, to help your allies or to assist pushing.

Battery Assault can practically silence heroes with a long cast animation (like Nevermore or Shaker). Be extra agressive in these cases.