Install ball assembly making sure tab in faucet assembly is inserted in ball housing slot

Install cam assembly make sure tab on cam is inserted in slot on faucet housing. Make sure the arrow is pointing forward

See picture with the allen wrench pointing to the arrow on the cam assembly. Remember the opening on the cam assembly is the arrow. Press the cam assembly into the faucet housing. With all the new seats, balls, and cam assembly, this can be difficult.