It's been a long time since 1981. Chances are your Bally Flash Gordon has seen a lot of locations.
Undoubtedly, your clear ball guides have turned a shade of yellow from smoke and UV.

Now you can replace them all with these laser cut acrylic reproductions.
They will brighten your game by allowing the light to shine through and sparkle on each fire polished edge.

Here's instructions on how to reuse the metal posts :

https://pinside.com/pinball/forum/topic/upkick-pinball-s-latest-shop-items#post-6786370