On Seiko 6309a, pallet fork and balance wheel not cooperating

[Bulletmagnate]

My balance wheel doesn't start after I wind the spring on my Seiko 6309a movement. I don't see any faults in the parts, though I am new at this. So I removed the balance wheel and pallet fork and bridge and the wheels take off spinning happily around, including the escape wheel. I must be missing a fault with either the pallet fork or balance wheel, or their interaction. Any advice is appreciated.

[Knebo]

Pictures please! 

Without the balance, but with the pallet fork installed, does the latter jump back and forth energetically when pushed gently from side to side? 

[watchweasol]

Hi. Leave the fork out and fit the balance and check for end shake nd freedom of rotation.  With the balance fitted use a puffer and give it a blow, should continue to rotate for  twenty/thirty seconds  if ok re fit the fork without the balance and wind the watch a few turns. Does the fork snap between the banking pins smartly if so re fit balance and observe.

[Malocchio]

My quick guess is that the balance impulse jewel is not inside the pallet fork