I made some ODIN-flashable files that contain the bootloader, RPM, TZ, and baseband of the stated versions, so that people won't have to go completely back to stock TW. It's intended for those not on the necessary bootloaders yet so that they can flash future CM builds. Put them into the PDA section in Odin and flash away.

I747UCDLK3 (AT&T): http://d-h.st/L64
http://www.mediafire.com/?pu279m19ob7ufru

I747MVLDLK4 (Canadian): http://d-h.st/yqV
http://www.mediafire.com/?74b1e321p537f5d

Tested by fellow users, works fine. Please flash at your own risk!

EDIT: Threw up Mediafire mirrors, since d-h.st seems to be down randomly.