Are the small inserts in these flare kits supposed to be close to the ID of the brake line? I have a K tool kit. I was flaring some 1/4 inch brake line and the fitting that says 1/4 on it was very loose and did not want to stay straight. It did not make a good looking flare. Seem crooked and oval. The 5/16 fits in 1/4 inch line and seems to make a nice flare. Could this kit be marked wrong or are they supposed to be pretty loose inside the line?