Are you releasing the lockdown bar receiver lever fully? Sometimes the mechanism becomes stiff preventing release.

That is a head scratcher? Pushing the latch in the right direction (downward)? Pretty sure that game has the shark fin type bar rather than the adjustable posts. Try working the bar left and right. When it wiggles is the glass moving with it? It could still just be stuck and need a little more force.

Is there a lot of rust? The bar could be rusted to the receiver.

Use your phone with the flash to take a photo inside the coin door shooting up to the receiver. That should give you a clue. Maybe some dummy used a screw or something.

There is a tab on the opposite end of the lever. This tab slides the latching mech that captures the screws on the lock bar.

If the lever moves freely and does not feel like it is moving the latch plate the tab could be broken off the opposite end of the lever. This would be a big problem.

If the lever moves the latch plate then it sounds like the lock bar is stuck to the playfield glass. Can you move the glass up/down a bit without the lock bar following it?

Pictures of the bottom side of the latch mech.

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Just another thought. Over the years spills can occur and run under lockdown bar gumming it up and maybe it’s stuck. Take a putty knife and slide it between glass and lockdown bar (CAREFULLY)and maybe get lucky!

As far as the playfield not locking down, you are actually missing part A-11348, which attaches to (1), and when the latch is locked, the pin will lock the playfield down by inserting itself into (2).

pin (resized).pnglockdown (resized).png

In your third picture it looks to me like there is a tab of metal either twisted or broken off down in the slot with the lever.

I agree the pictures make it look like this tab that you can see in the pictures of the loose mech I posted may be damaged.

There isn't much access to this area with the latch mech and lockbar and playfield installed. You want to get to that latch plate and push it to the right to get the lock bar to release.

If worse comes to worse you may need to break the playfield glass, remove the retainer bracket at the top of the playfield (6 screws), two brackets at the bottom side of the playfield that clip into the locking mech (6 more screws), and swing the playfield out of the body. You should be able to get to the screws holding the lock bar mech at that point and salvage your lock bar. You'll need a new playfield glass and a lock mech. Both of those together will be cheaper than trying to find a replacement lock bar.

Try to compress the sides of the game slightly with a pipe clamp, just above the lockdown bar and wiggle it again.

In one picture I can sort of see a metal tab bent up, suggesting the locking mech is fused in place/wont slide back and forth. I had this on a game once, took the whole cab face off

In this case... break glass, take off the top bar and lift pf out from the top, disconnect it etc. With the pf out take off the shooter and then the 6 mounting screws for the receiver and you should be able to remove the bar and receiver as one piece. With a little luck you can salvage the bar and then one of us can provide a new receiver assy. They are also on ebay...