Super Glue down in the threads of a fastener or in a pin secured in a hole.
It sets up near instantly when the threads tighten or the pin interference fit becomes tight.
It locks the screw or pin in tight.
Acetone on the surface won't undo them.
I'd guess soaking the parts in it for a while might, but it's easier to touch the head of the screw or the pin with the tip of a soldering iron to heat it up. Softens the SP and the two can be separated.
It takes more than a bit of heat to loosen them too.
Fakers will sometimes lock the screws into a gun inclu the wood screws securing the butt plate and trigger guard by S/G'ing them in place.
Not wanting to damage perfect looking screw slots and engraved screw heads,,that stops inquisitive prospective buyers from checking under & inside those metal parts for replaced items, new wood, refinishes, ect.
They won't budge with any normal screw driver attempts at removal.
Quick and simple.
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The part you are removing to get the lever out is the 'Finger Lever Link Pin'
In these later mfg 94's, it's a press fit pin,, hammered into place . Nothing more.
Earlier mfg 94's (pre 1992??),,the part was called the 'Finger Lever Link Screw'
Obvious difference,,it was a screw with a slotted head that entered from the left side of the link to hold the lever in place.
* Winchester calls that lower pivoting part the 'Lever Link',,I call it the bottom plate..