In my experience as a home maintenance enthusiast, dealing with pop-up drain assemblies can often be tricky, especially when the stopper doesn’t open fully. This usually points to linkage misalignment, where the connecting parts inside the sink’s drain mechanism are not properly aligned, causing the stopper to get stuck or operate inefficiently. When I tackled this issue, the first step was to carefully remove the sink stopper and inspect the linkage rods. Often, the rods that connect the lift handle to the stopper can be either too high or too low, making it impossible for the stopper to move freely. Adjusting these rods by loosening the pivot nut and repositioning the linkage helped resolve the problem. It’s important to test the movement after each slight adjustment to ensure the stopper operates smoothly. Additionally, checking the pivot rod and ensuring it isn’t bent or damaged is crucial. Sometimes debris or mineral buildup inside the assembly can also prevent smooth operation, so a thorough cleaning can make a big difference. If you’re performing this repair yourself, make sure to keep track of all small parts and take pictures before disassembling, as reassembling the pop-up drain can be delicate. In cases where the stems or washers look worn out, replacing those parts can prevent recurrence. Consulting online plumbing forums and videos helped me understand the detailed mechanics, and having a basic plumbing tool kit made the job manageable without professional help. Having resolved linkage misalignment issues myself, I appreciate the importance of precise adjustments and routine maintenance to keep sink drains functioning properly. If your stopper also gets stuck or doesn’t open fully, reviewing your linkage assembly for misalignment might be the best place to start.