Distribution Block Question ( for Eagle ? )

[Dandxj]

I have the Distribution Block disassembled and I am cleaning it. I am using a 1/16 in. drill bit to ensure the line ports are clear. The bit goes in

fine for all the ports except for the by-pass port on the bottom of the block. The bit enters the port but will not go through to the center. I can insert a small wire through and it is visible looking down the plunger hole. I can blow into the port but it is much more difficult than with the other ports. Does the by-pass port have a reduced size at the bottom ( top if it were in the truck ) or is mine clogged ?

[Eagle_SX4]

This might help.