I've had good luck with the homebrew modifier I made to fit my Metz 45CT-4. I bought one of those Rubbermaid disposable food storage containers with the screw-on lid, and cut a hole in the lid big enough for the flash head. Then I took some coarse sandpaper and roughed up the interior. It costs me about 2 stops when used in bounce mode. The Gary Fong I have that fits my smaller flash units was $60. This? About $1.