I had a thought, and it may not cost you a dime. Go to the scrap bin for the hose section of your local hardware store, use an inch of 3/4" ID x1" OD tubing along with a piece of 1"ID x 1 1/4 OD tubing. Fit the airlock in the 3/4 tubing then put the 1" over the 3/4", then jam it into the carboy...