Anyone know the lens diameter for 3520 searchlight car?

Thanks for your reply. 

I’m actually trying to go the other direction. I want to replace the red lens with a clear one, and I thought the searchlight car had a similar sized lens. 

Tom

I pulled a 6520-11 lens out of my parts box and it does fit in my 494.

That’s great news ROSS...

Thank you so much for your effort!

    Tom 

Tom, the searchlight car lens is much heavier than the lenses on the tower. I don't think it will work with all that weight. Don

If all else fails grind a flashlight lens to size.

If you need glue for some reason; tabs, etc.; use canopy cement from Testors. It cures clear as day.

It may work if rebalanced. Hard to say if the air would still spin it with extra weight .  It wouldn't take much to balance it. Some sheet metal scrap glued should be plenty. (don't forget glue has some weight too)

Interesting...

  One would think they’d be a nearly identical casting, just a different lens pattern.  I’m really surprised the 6520 lens is much heavier...

  I have a digital scale that goes down to tenths of a gram, this would probably get it close. Easy enough to balance  while it’s taken apart I imagine. 

 Knowing full well the reputation of the 394 before I bought it, I liked the more realistic rotational speed while still havingthe bulb fully bright.  The 494 always reminded me of a German Discotheque at 4am when it was cranked up...

Naturally since I tweaked mine to a nice prototypical and sedate 6 or 8 rpm, now I want to change it.  

I’d completely forgotten about canopy cement, takes me back to my 1/48 Monogram & Revell days!

Thanks for for all of the tips everyone! 

Tom