Originally posted by GibbyTheMole ... to connect my Sunpak 422D to my Pentax DSLRs and use with a flash bracket for off-camera manual flash use.
For a Sunpak 422D (or any of the Sunpak flashes that take the dedicated module), get the "Sunpak Dedicated Remote Cord EXT-10." It's only a few bucks from KEH:
Link.
If the EXT-10 is not available, the EXT-08 will do.
It's very solid. The best thing is that the light sensor of the flash always facing forward, allowing you to use flash auto mode no matter where the flash head is facing. The setup will look like this (the bracket & handle are recycled from a dead Sunpak 522):