I tried searching for this first, and from reading other posts I think I know the answer, but I want to make sure.
Example (not worrying about the drain portion):
Mage summons a spirit, mage gets 4 successes, spirit gets 1 for 3 net. Mage has 3 services from the unbound spirit at this point.
Mage then binds the spirit, mage gets 3 successes, spirit gets 1 for 2 net(1 of those used just to bind). Mage has 4 services from the now bound spirit at this point.
Mage decides to rebind the spirit for more services, mage gets 3 successes, spirit gets none for 3 net. Mage has 7 services from the bound spirit at this point.
Is this all correct and if not where did I mess up?
*Edit - Forgot to state 4th edition.