I think you may be right about the size though Panther F, thats why I dont understand you would think that 3 screws in a turret motor would be all the same but the head on one of them wasnt as deep as the other two. Like I said earlier though thats all I have done for a month now is dissamble and spray a base coat and the put the tanks back together again. I only have 2 more tanks to do then im done and wont have to open them up as much.