I think so - I see four spots that seem to be chewing gum - two to hold the sight wand to the tin, and two to hold the protractor to the tin.

I think duct tape would have done just as well.

For the general function of "attaching things together", duct tape, cord, thread and wire are all popular survival kit items, and of these duct tape seems most apropos here.

Given the choice, I'd use kneadable epoxy putty stick* rather than a wad of chewing gum, but I currently don't carry either. And I wouldn't advise chewing the epoxy ...

*I repaired my broken eyeglass frame with this once.