Hi, 1) I have a project watch, a Breitling Chrono-Matic caliber 11 - there is a defective part 8086, aka "oscillating pinion" - part 8086 from my cal.11 is bi-metallic ie. it is made of brass and steel, and hence it wears off quicker I understand - is de oscillating pinion from a cal.11-1, which is made entirely of steel, interchangeable with that from a cal.11? 2) any idea where I can source the oscillating pinion - hope someone can assist me on this - thank u - Edwin