How do you insert large diameter cables (e.g. SPN1/BF5 cables) into the GP1/DL6 cable glands? - Video Guide
The following video explains the best way that this can be done:
https://www.dropbox.com/s/lx9oyan70i75sgu/8%20way%20cable%20with%20sound.wmv?dl=0
Example in video is 8-way BF5 cable and GP1.
The GP2 logger has an optional expansion lid (GP2-G5-LID), which contains larger cable gland sizes to help with large diameter cables.