[sevman]

I am a draft tech. with Budweiser in Atlanta,went to repair a broken faucet,removed the faucet replaced the lever then I was unable to put the faucet back on the collar screwed on, but not far enough for the piston to seat inside the shank.The tower was not a micro matic but the faucet was.the threaded portion of the faucet seemed a little large than most faucets.How did somebody get it on there to seat properly?I used a faucet wrench because I was unable to tighten the collar by hand. Is there a certain technique or trick that I am missing?
b