Fixing a squealing flyback - safety question

[DaveStall]

My old Robotron machine has developed a rather annoying high pitched whine coming from the monitor chasis.  After poking around at Bob Robert's site, I am guessing that the flyback transformer core has become partially separated and needs a small wedge shoved in there to tighten things back up.  I have to confess that I know very little about monitors and I am a bit concerned about the amount of voltage stored in the tube, so I have just been living with the annoying sound for awhile now.  My question is:  do I need (or should I even) discharge the tube before trying to fix this?  I would like to at the same time clean up the machine including the monitor boards.

Thanks in advance,

Dave

[SirPeale]

I guess it depends on what exactly you're going to do.  If you're going to remove the chassis from the tube, then yes, discharge.

[DaveStall]

I wasn't planning on removing the chassis, I just want to get rid of that terrible high pitched squeal which probably entails tightening any loose screws or perhaps getting a wedge in between the core and frame of the flyback.  I don't plan on touching the anode cap area at all, but I guess it is better to be safe than sorry.

Dave

[Ummon]

Far as I know, discharging a tube isn't unhealthy for it, so any time you get close to the rear and insides of the thing, go ahead and do it. If you're worried about the discharging itself, then probably you shouldn't worry about fixing it yourself.