Just had a Delta kitchen faucet installed (model 21996LF-SS). I need to attach a water filter that has a 55/64-27 female bypass valve. When I contacted Delta, they say this faucet takes a 3/4"-27 aerator. I bought a faucet adapter with 55/64" male to 3/4" female and it is way to big (see pic). I also bought a 13/16" adapter, which was close but still too big. Ideas?