I am looking at a 20B that looks to be an early one before they added additional

metal in the dowel/oil passage area of the iron housings because of some that I have

read developed cracks in this area in service in the autos I presume.......

     Can you tell me if this a potential problem for the 20B in our aircraft use ?.......Also

can you tell me if your 20B has the later reinforced housings ?.........  

--