The incomplete part in your middle picture is the knocker. The parts missing in your knocker are the coil and plunger. Coil should be #AK-27-1300. Not sure of the plunger, but both can be ordered from PBR.

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What you are missing is the knocker and it looks like your match unit is in pieces. I have a spare of both.

As far as cleaning the score reels - I have used plain water on a rag, and wiped easy - if too heavy, you can wash the ink off. In my experience, any type of window cleaner will remove the ink, and on some, even alcohol will remove the ink.

I recommend you try on one small area to see if the water works. If it does, then do small sections at a time - the rag should not be dripping wet - you don't want dirt tracks running down the reel.

Cleaning reels can be really tricky. I have a Bally "Flip Flop" here which I am doing for a customer. He gave me a spare head, which was very rough. I tried cleaning some of the reels from it to install on the keeper game. It seemed that where heavy dirt sat on the reels, something attacked and loosened the ink. Those numbers came off with any kind of cleaning. The other parts of the same reel were more durable, and even a paper towel dampened with Windex was safe to use.
The bottom line is, every case is different, and you need to proceed with extreme care when attempting to clean any plastic score reel. And....have a black Sharpie handy!

Would nova 1 be ok?

Maybe. As jrpinball said, "every case is different."

I have used windex and alcohol. On some reels it works fine. Careful, it may remove the paint on yours.
I have used mild soap and water. On some reels it works fine. No guarantees it will work on yours.

All depends on the paints used during production and the environment your reels resided in. A little missing paint can be repaired with a steady hand and a Sharpie (again, as jrpinball stated).

I had bad luck with alcohol on one of my machines.

On the bright side, I asked with regard to a four player game and am lucky to find even a second player. So I can test with the 5 on player four… no one will ever see it.

Alcohol? What strength?
I've heard of using everything from Wonder Bread to Novus 2.
I once had a friend call me and said he cleaned the reels on his newly acquired "Flip A Card" with Castrol Super Clean. And that was the original formula Super Clean, which was much stronger than the stuff they sell now.
I asked him how he can tell what his score is, because there couldn't possibly be any numbers left on the reels. But, amazingly, they came out squeaky clean without any damage. It's a mystery why some are so fragile, and others seem impervious to any cleaning method.

91%. As soon as I saw what I’d done I did a ‘Doh! and got out the Sharpie. I’ve used Novus 1 ok, but not on a Bally. This will be my first Bally EM.

I'm sure it's posted but how come score reels are not made?

All that needs to be made are sticky overlays which can be applied to the original reels.
I believe someone has made some for some applications, but I asked PBR if there were any available for Bally reels, and the response was negatory.

I suppose decals are ok and they have there place in the industry. Is that what the pros use when restoring and machine for a client?

*a machine*

The match unit, or more properly the 00-90 unit is the one that is all apart and apparently missing the coil. It is called the 00-90 unit step-up solenoid so if you use the reference chart on the schematic from a IPDB to locate that you will see it is labeled as CD-29-1600.

This post might help you to get the 00-90 unit back together and running.

https://pinside.com/pinball/forum/topic/bally-em-00-90-match-unit-torn-down-analyzed-and-demystified

Steppers are all going to need de-gunked.

A small amount of dish washing soap in warm water and my reels all come clean with no loss of numbers. Those are Williams reels though.

No rush… I’ve got a machine and a half before I get to my OC. Unless I bump it up in line ahead of Drop A Card.

I’ve taken the home screen shortcuts off my phone for OfferUp and FB Marketplace so I can’t be tempted until everything I already have is ready to play.

1st question : do you like the band Rush?

No Rush? Excuse me??

I don’t have any of their albums and couldn’t remember any of their songs besides Tom Sawyer, but I’m good with them. Could swear I’ve been to a concert of theirs back in the day.

Speaking of classic rock, I couldn’t say where she’s coming from, but I just met a lady named Dinah Moe Hum.

Where's this Dinah Moe comin' from?

Go on YouTube and search "One Man Rush". This guy is amazing!
He does Genesis and Yes too.

Guess I’m out of touch. What is the Rush connection with pinball?

cdnpinbacon is a wildcard.
You never know where he'll take a thread!