Need advice: How to fix a rattling MR ST:TOS Tricorder?

[temponaut]

Something has come loose inside of the swiveling top section of an MR ST:TOS Tricorder in my possession. It sounds like something relatively large -- more substantial than, say, just a screw. :confused

As far as I can tell, whatever has become dislodged in there isn't (yet) interfering with the electronics -- lights, sounds, screen, and moiré all function correctly -- but still it bothers me. :cry

Does anyone have (1) a good guess as to what's rattling around in there, and (2) a reliable procedure for opening the top section so that I can make repairs? I haven't studied the compartment much, but it looks to be pretty well sealed.

Thanks for any advice you can offer!

 

[phase pistol]

In this zinc-plated, vaccum-tubed culture?

 

[temponaut]

Mechanised, electronicised, and not very human. :sleep

 

[temponaut]

Anybody else? Help?

I'm gonna open this thing up. I sure would like the advice of someone who's already done it first, though. :confused