Quoted from Joydivision:

Your clear plastics are broken where the captive ball sits (you probably already know) which is a very common problem with Fireballs. The 2 posts in front are not original & have been added because of this.
However, you can buy replacement clear plastics from the Pinball Rescue from the link below is you want to restore the set up to original.
Pinball Rescue are closing for good on June 7, so you will need to order now if you happen to want them! I'm pretty sure you can't get them anywhere else.
http://www.pinballrescue.net/Plastics_Fireball.html

Quoted from waltrr:

Pinball Rescue is closing tomorrow for good, so if you want anything, you need to do it now.

Quoted from Jappie:

Does anybody have a tip on how to get the slingshots nice and snappy, without the machine gun effect kicking in?

Quoted from fingersport:

Ok I want to test the waters. I took a complete set of clear plastics out of Fireball to a shop and asked for a price for 25 sets. I did complete sets and not just the two pieces that break because my guess is most Fireball clear plastics are yellowed like mine and the difference in cost was only about $15. Why not get a complete set. You will need to transfer the small bell shaped stand offs but a post in this topic covers how to do that. It does not look hard once you know the tricks. If someone finds that before I do please repost that here. Cost for the 6 piece set will be $50 plus shipping. I'm new at this so I'm not sure how to deal with the shipping part. The plastics will be made of a material that will stand up to any type of shipping so it may be possible to use bubble wrapped envelops. Not going to get rich with this project but it should be some fun helping out other Bally and Fireball Fans. If this works out I may do other Bally games from this time period. Let me know what you think and send me a PM if you want to get on the pre-order list. Thanks

Quoted from FantasticPinball:

Hoping to re-enter the club. Sold my Fireball many years back but recently agreed to purchase one that is a major project. The head is from another game and a correct Fireball head will have to be created from parts. I’d much rather buy an original head if anyone has a parts machine.
Fantastic

Quoted from FantasticPinball:

Never hurts to ask..

Quoted from Joydivision:

I purchased a NOS Fireball backglass on Ebay a few years ago, luckily I managed to get it shipped to Australia safely & still in mint condition.
As seen in the pics it was still in the original wood packing crate, complete with newspaper pages from 1971!
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Quoted from jlbintn:

.
How close are your flipper tips to each other, when closed? Probably not related, but might be worth looking into. The armature plate can be finely adjusted.

Quoted from jlbintn:

There is a knocker, but it is puny. If you match, you most likely won't hear it because the ball is kicked out of the outhole into the trough about the same time the knocker plunges for the match.
I put in a Sega knocker, after taking off the diode. Much better sound. I'm looking around for a metal tip knocker plunger, and mounting it and a metal plate to get some cool sound.