I have a kitchen faucet with a pull out sprayer. The spray head says AMFAG on it which is the only designation that I can see. The head fits into a pocket on the faucet base but the sprayer will no longer slide back in. I can jam it in but then cannot pull it back out. This seems too simple a problem - the inner sheath on the pocket is lined with a plastic sleeve; I've thoroughly cleaned this and even lubricated it but still cannot get the spray head in and out. Any thoughts for me? Thanks.