100 YO Doorknob Repair/Replacement

[url]https://imgur.com/a/FPYaaFP[/url] I wanna remove it, so I can re-tile and put it back. But one of the door trim piece (I think it's a door stop) is sitting on it and preventing me. What can I do? And is the door trim piece suppose to sit right on top of the floor transition strip? Or should there be so space?

Hi there, With summer heat approaching, I purchased a window AC unit from Costco to help keep our bedroom cool. Unfortunately, I have those pesky horizontal sliding windows that aren't built to house window ACs. I've found a few guides online that provide some guidance on installation. However, last year, I noticed that my windows in the bedroom were coming apart from the frame(?) I'm not sure if that's the case, or if the windows aren't really a cause for concern. The windows feel secure when i push against them, but considering there will be a 70lb AC unit tipping to the outside, I really would like to avoid a potential nasty accident. The windows appear to be coming apart from the wall and causing gaps across the left, right, and top edges of the window & wall. I'm not sure whether this is an issue of expansion/contraction, or just a poor install. My understanding is that the windows were installed about 7 years ago. The AC will be installed on the second floor of my place. Right below the AC installation area is my porch roof (tin roofing). The tin roofing is slanted towards a mildly busy sidewalk. My fear is that the AC/Window will fall out from the frame, onto the roof, slide down the tin roof, and land on someone or against a parked car. I recognize that pictures may not be enough to tell, but I'm hoping someone could share some insight as to whether I should be concerned, or if I'm just paranoid. [url=https://imgur.com/a/gKJs06C]Here are some photos of the windows.[/url] [i]AC Window left side-- notice cracks along the window and wall/frame (esp. at the top)[/i] [i]AC Window right side-- notice cracks along the window and wall/frame[/i] [i]Smaller window frame (left side) to demonstrate issue[/i] [i]Smaller window frame (right side) to demonstrate issue[/i] [i]Smaller window frame (top) to demonstrate issue[/i] Do you feel that that they need some work? or is this a superficial issue? Should I trust these windows to hold a 70lb AC? Thank you :)