I just checked your link to CP's tapes, Tim, and found that I ordered the tape for "'51 - '72" instead of the stuff that I'd ordered previously for '51-'54. Even though they both show that they're 3/64", the tape that I've got that isn't letting me get the window in is not what I've ordered the two previous times. Maybe that's it. I'm putting it in with rtv this time anyway, but will get a few off of Restoration Specialties for my next one. Thanks again.