Some Vigilant questions

[Fruitfarmer496]

Still mucking around with this 1977 model Vigilant, and been reading as much information as I can get on how it's supposed to operate.
I am still trying to figure out, exactly where the secondary air enter the actual firebox. Seems that in this stove, there are 5 "primary air inlet ports" in the "fireback", I haven't seen a Defiant model what pictures seem to show secondary air enters from a tube in the right end of the firebox. My Vigilant has a inlet port with a swivel cast cover on the left side, I have shoved a metal rod through this passage but can't determine where it exits inside the stove. I would think it would provide additional heated air to the cut out in the fireback in the lower right hand side of the firebox?

 

[fbelec]

on the defiant it goes from the same left hole to the other side of the stove where it goes into a manifold and is spread out back to front so the smoke and gases hits a wall of heated air for a second burn. yours doesn't take the turn from back to front. put your hand up that hole and you should feel a tube with a slot cut in it. that's where the air gets mixed for a second fire. i'm going by the manual pictures