Wow! Lots! I just used a connector to replace a lost Radio Control plug.
If used old Black Small pinball Rubbers for feet on objects, spacers, and a rebound EM , for a door stop.

My Bulbs are in My yard, landscaping and school kid projects.

I use Novus, p13, Pinball Rubber cleaner, really every cleaner chemical everywhere.
I just restored the water dispenser on the fridge.

The Metal Rail protector, in the shooter lane has been used where doors bang, and smaller protectors dont work.

And of course, I use my old balls for art, as well as in a sock for a gluing weight or weapon!

Im sure I have lots more....

Now about the plumbing parts I put in my Fire pin.....

Not so much the parts but certainly the tools and the accessories.

My apartment is pretty much held together by Amazing Goop at this point.

My scooter has a stupidly complex ignition switch that does so many things. It's the ignition switch, seat release, steering lock and fuel cap release.

It became near impossible to make it release the fuel cap so after wasting an hour trying to repair it (and not wanting to spend $100 on a replacement) I made a bracket for the fuel cap release and added a 'pull wire' with a pinball post for a handle. Pull the post and the cap on the left side releases - TaDa!!

It's worked perfectly for a year now!

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I used a ramp screw to secure the bracket for a flush mount zigbee contact sensor after the tiny screw rolled somewhere, never to be found.

I used pinball post rubbers to replace the old hardened vibration damping mounts on my air conditioner.

Pinball LED’s in my landscape lighting, changed the colors depending on the season / holiday.

Some years I build a custom string of lights for my pumpkin at Halloween, using pinball stuff. For example I made a covid pumpkin a couple years ago, covered in marshmallows on bamboo skewers and then spray painted green. Then custom red lights for the eyes and green for the goop it was throwing up.

So far nobody has admitted to using bulb cover / condom as a real condom. But there have been some good stories. I’ve used rubber rings, pinball switch and blue rubber Stern pads mostly to shim things or keep various things going around the house.

I an inoperable sink pump with a micro-switch.

When I sold my house two years ago,the township required screens on all of the windows. I never used this window, and it never had a screen,so I made one with junk wood I had saved.
Notice the handles, they're old pinballs.

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I can't say that I've used any actual parts for repairs, but I've used tools (that I probably wouldn't have if it weren't for pinball) plenty of times.

Not a repair, but used a post rubber on the shower head pipe to keep the shower caddy from sliding off.

For a second after mentioning bulb condoms I thought you were going in a completely different direction with your mention of rubber rings right after.

This is kind of like the hack thread, you got to point it out to me because I'm not seeing it.

Ah damn, I was gonna try that angle for fun. Lol. Bulb condoms on the other hand sound like a disaster

Pinball leg speared halfway in the ground to hold a reflector.

Okay, I see it now. Good use for that.

I restore vintage transistor radios too, and the plastic volume dial on one was all worn out where the screw holds it on. Had a ton of slop and would keep working loose. Snipped off a little rectangular piece of a switch blade from a scrap Gottlieb relay to fill the worn-out area in the plastic, drilled a hole in it for the screw. Fixed! Okay so I didn't fix my washing machine with an old score motor but it's something.

When working on our 1950 Studebaker, was pleased to find out the burned out bulbs in its radio were our trusty #44s, so already had replacements on hand! I work on a railroad...those bulbs are used in the control stand (kinda like a dashboard, holds the controls and gauges) lighting too.