Through diligent study and experimentation, you have discovered how to imbue life into a clockwork shell, allowing it to function as a familiar.  The clockwork familiar can take the form of any of the following: bat, cat, crab, frog (toad), hawk, lizard, octopus, owl, poisonous snake, fish (quipper), rat, raven, sea horse, spider, or weasel. The familiar has the statistics of the chosen form, though it is classified as a construct instead of a beast and its AC increases by 1.  Familiars with fly speed or swim speed cost an extra 25 gp to create and take an additional 2 hours of casting time.  Once you have created a clockwork familiar in this way, creation of a secondary clockwork familiar costs half the gold and time.

Your familiar acts independently of you, but it always obeys your commands. In combat, it rolls its own initiative and acts on its own turn. A familiar can't attack, but it can take other actions as normal.

When the familiar drops to 0 hit points, it breaks, leaving scrap metal equal to 1/4 its original cost.  You can rebuild it through another casting of the spell.

While your familiar is within 100 feet of you, you can communicate with it telepathically. Additionally, as an action, you can see through your clockwork familiar's eyes and hear what it hears until the start of your next turn, gaining the benefits of any special senses that the clockwork familiar has. During this time, you are deaf and blind with regard to your own senses.

As an action, you can temporarily dismiss your clockwork familiar. It disappears into a pocket dimension where it awaits your summons. Alternatively, you can dismiss it forever. As an action while it is temporarily dismissed, you can cause it to reappear in any unoccupied space within 30 feet of you.

You can't have more than one clockwork familiar at a time. 

Finally, when you cast a spell with a range of touch, your clockwork familiar can deliver the spell as if it had cast the spell. Your clockwork familiar must be within 100 feet of you, and it must use its reaction to deliver the spell when you cast it. If the spell requires an attack roll, you use your attack modifier for the roll.