I'm trying to figure out if a solid core door would be too heavy for my type of door frame. My house's interior walls are basically a single sheet of 3/4" MDF. The doors are framed with 2x3's where the MDF is cut out. In the attached pic, that's not trim, it's the 2x3's. Currently the doors are cheap hollow core doors that of course barely do anything to block sound. While the rooms are never going to be close to sound proof because of the single-wall construction, it's obvious a majority of the sound is coming through the doors. The house was built in 1970 and I'm sure the doors aren't original. So, my question is: Will a solid core door be too heavy for this type of door frame? [ATTACH]75156[/ATTACH]

The top wood sash (old double hung window) slides down if the window is not latched. There is one metal window tension spring installed on either side of the sash, but it does not hold so good -- I think because of the weight of the sash. Sash measures 36 wide by 38 tall. It is an old window, very heavy with wavy glass and would be expensive to replace. I do not want to glue/nail the top window shut, because I want to be able to remove it for cleaning. Are there any metal brackets or fixture I could install to keep the top sash in place? I have seen the following items for sale online, but I don't know their purpose or if they would resolve the issue: sash spring bolt sash stay stop bead adjuster Thanks!