I've had really good luck with Dry-Lube with PTFE (Teflon) in my magazines
for both pistol and rifle. It does not get gummy and does not collect dust.
It could be better for rust prevention but that is not it's main purpose.
I'm getting more into synthetic lubrication for my heat, teflon should be
part of everyones medicine chest... There are a couple of brands, the
Liquid Wrench brand comes to mind (Gunk now).
I don't know anything about projectors... :)
> I've had troubles with the large slide trays in the Carousel projector.
> Always liked the 80s for better reliability. Check the bottom of the
> slide tray to be sure it rotates easily. If it drags the slide can't
> drop or return smoothly. That is why the 80 slide tray with its thicker
> slots seems to work better.
>
> Otherwise the rotation and slide changing mechanism is all inside the
> projector. It has to shove the slide up before it can turn the tray.
> Warped slides in the 100 slide tray can bind to inhibit the slide
> returning to the tray. And the tray can't advance with a slide stuck
> half way up.
>
> I bought a new projector for my work several years ago and so far its
> given no troubles. I used it mostly in courtrooms to present evidence
> and couldn't tolerate problems. Never needed 100 slides either. Half a
> dozen usually was plenty so the wide slot low count slide trays were
> adequate and with the wide slot a reliability benefit.
>
> The internal mechanism could be gummed up with lint drawn in by the
> cooling fan too. Might need cleaning and lubrication. I'd lean towards a
> silicone grease for the high temperature operation I think.
>