Window won't tilt open anymore - here's what I tried

Had a similar issue with mine last summer. Sounds like you're on the right track, but if it's still stiff, you might wanna try lubricating the metal arm and track. A silicone-based lubricant spray usually does the trick - WD-40 makes one specifically for windows and doors that's pretty good. Just spray a bit along the metal track and mechanism, then open and close it a few times to spread it around evenly.

Also, double-check that the arm is aligned correctly in the track. Even a slight misalignment can cause stiffness or resistance when opening. Sometimes it looks fine at first glance, but if you watch closely while operating the window slowly, you'll see where it's catching or rubbing.

One thing I learned from experience: don't use regular WD-40 or oil-based lubricants - they attract dust and grime over time, making things worse in the long run. Stick with silicone or dry lubricants designed specifically for window mechanisms.

If lubrication doesn't fully solve it, you might wanna inspect the hinges themselves. Sometimes dirt or debris builds up there too, causing friction. A quick clean-up with an old toothbrush and some mild soap can help loosen things up.

Worst-case scenario (which hopefully isn't your case), if the metal arm or track is slightly bent from forcing it when it was stuck initially, you might need to gently straighten it out with pliers. But be super careful if you go that route - it's easy to make things worse if you're not gentle enough.

Good luck with it... these little window issues can be annoyingly tricky sometimes.

Before adding lubricant, I’d check that the sash is still square and evenly seated in the frame. A shifted sash can make the arm bind even when it appears properly aligned in its track.

- Open the window slightly and check whether the gap is even along the sides.
- Make sure the sash isn’t rubbing at one corner or sitting lower than the other.
- Clean any debris from the hinge and track first.

If the sash is out of square, lubrication may only mask the problem and could make the mechanism harder to diagnose. Once it’s seated correctly, use a small amount of silicone lubricant and operate it slowly to identify any remaining catch.