Wow, had the same problem. Mine being about 3" left of centerline (driver's side). Got the same quote about pulling the glass. What I did - -
1. Hot day outside, let car sit.
2. Used nylon 'spatula' or body-filler spreader with rounded corners to 'wedge' between body and windshield gasket.
3. With spatula making room, laid in a bead of Windshield Sealant (I think Mr. Gasket; doubt if it makes much difference) all the way across. I moved spatula and Sealant at the same rate attempting to be smooth. (Note the word "attempting".)
4. Wiped excess Sealant with "Pre" but considered letting it dry and cutting, but I don't trust my razor skills that much.
No more leaks. Others with actual windshield experience may offer better, more-detailed advice. (We hope!)