I use this method all the time with new games if the lights keep popping out of the spotlights. It works 100% of the time in my experience, and the bulbs never fall out again. It's WAY cleaner-looking than silicone or hot glue, IMO. You can't see anything is different once the bulb is installed. I'm showing a random LED bulb I grabbed to demonstrate this in the picture series, but it works for the LED flashers, too.
You need to cut a small piece of black electrical tape about the length of the bulb, and about half the width the electrical tape comes on the roll.
Then, carefully lift up the two "legs" of the bulb to get them out of the way.
Wrap the tape around both sides of the bulb, sticky side of the tape towards the bulb base.
Fold the two raised "legs" gently back down over the tape.
Put the bulb back in the spotlight or socket for likely the last time. It will grab a LOT better and likely never come out on its own from vibration again.
All done with this project? Here's a couple other DIY guides I've made for newer Spike machines:
How about a pool noodle to protect your playfield glass when it's off the machine:
Are LED lights popping out of your spotlights (not just on Spike machines!)? Make sure they never fall out again:
Have a Stern machine from KISS or after with the softer wood cabinet? Reinforce it to prevent a splitting cab:
Want to have the option of operating the action button on your spike game with a foot pedal?
Have an $80 alibaba hologram fan topper you want to cleanly power so it turns on and off with the machine? Do this:
Are your Iron Maiden speakers crackling when you crank it up? Fix that with a cheap external amp:
Add a working lockdown bar button to your Iron Maiden
Deadpool Katana entrance protection:
Is your Spike machine occasionally resetting during hectic play, torpedoing your high score runs? This guide to fixing it might be for you:
Do you have a WoZ ECLE and think it's too loud in a quiet room? Replace two fans and make it almost silent:
And here are some other plug and play mods you can just buy:
Iron Maiden Light Tree Mod for colored mode lights:
Metallica F-U-E-L lights bracket:
ColorDMD gasket for Stern machines with the angled speaker panel: