Here's the step-by-step to fix the targets that may brick (ball hits target, target doesn't drop) on your 2023 run of Stranger Things. The new run has new flipper bushings that make the flippers a bit more powerful, sending balls into the targets harder, which can make them brick instead of dropping reliably. James Bond Dr. No had this same issue, with the same too-weak springs. The fix is the same - cut the springs.
To do this, you need:
Phillips #2 screwdriver
Standard blade-type screwdriver (wider tip, the better)
Precision cutter (or a wire cutter)
1/4" socket with driver or rachet to drive it
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First - TURN THE POWER OFF to avoid any unfortunate mistakes with electricity. Glass off, remove balls, playfield up.
I find fixing the springs is easier with the assembly out of the machine. So remove the whole drop target assembly:
First, using a 1/4" socket, unscrew the four screws holding the unit to the playfield. Set the four screws aside.
target_step2 (resized).jpg
Next, unplug the coil connector. I do this second so there's a bit of safety when you untether the unit from the playfield in the step before.
target_step1 (resized).jpg
Then turn the assembly over. There's a connector for the optos on the opto board on the back.
target_step3 (resized).jpg
The connector is pretty tight, so you might find it useful to use a wide standard screwdriver blade to pry it up on each end so the connector can be removed easier. AGAIN, THE POWER SHOULD ALREADY BE OFF AS YOU ARE DOING THIS.
target_step4 (resized).jpg
When the target assembly is out of the machine, use the #2 Phillips to carefully remove all 8 screws from the opto board and remove the board. You CAN do this spring fix without removing the opto board, but it's a pain. Just remove the opto board, trust me. Set the board and 8 screws aside.
Note the orientation of the spring loops on the assembly, then remove the first spring by unhooking the red end at the bottom, then angling the end on the middle of the target up and off.
target_step5 (resized).jpg
Eyeball about 25% down from the top of the spring on the end OPPOSITE the red coating and separate the coils a bit so you can cut the spring there. Cut the spring a couple coils up on the spring from where you want the spring to be at the end to allow two rows of loops to be flipped up to hook on the target again. Separate two turns down from where you cut and bend that up to create a new hook point. Here's a reference of one I cut relative to the original length. Cutting too little is worse than cutting 5-10% too much, IMO, because if you're too timid and leave the spring slightly too long, it won't fix the bricking issue for that spring because it will still be too weak/slow to pull the target down fast enough.
target_step6 (resized).jpg
Re-install the spring by looping the non-colored end to the target hook, then stretching it and hooking it onto the metal assembly, again noting the orientation of the loops relative to the assembly - use the ones still connected for reference.
target_step7 (resized).jpg
Repeat the process for the other 3 springs.
Re-seat the opto board to the post standoffs, NOTING THE ORIENTATION OF THE OPTOS when you put it back. They MUST straddle the "flag" on the end of the target as seen in the picture below:
target_step8 (resized).jpg
Put the 8 opto board screws back on to secure the board again, and re-attach the opto connector, noting the orientation of the connector is correct.
Re-attach the assembly to the playfield with the 4 wood 1/4" screws.
Reconnect the coil connector.
Drop the playfield, re-install balls, re-install glass and lockdown, power on and enjoy your more droppable targets.