I am helping a friend with some faucets that have no water coming out. These are 10 year old Delta lav faucets with 2 handles and a center spout. I verified that the strainer wasn't the problem and pulled out the cartridges. I have water up coming out of the faucet body on both sides. When I put one cartridge back in and open that valve handle, water will come out of the opposite cartridge location and vice versa. It seems like that means the cartridges are OK but there is a blockage at the point where the 2 sides go into the spout. This was on a double sink, this side was used infrequently. I tried pushing a wire down through the spout but wasn't able to clear anything. I would appreciate any ideas. Thanks!