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The weight capacity depends on the construction method and the quality of the hardware.  Basic side-mount slides often support 50 pounds, but less expensive versions may be rated lower. Properly built drawers with dado joints and heavy-duty, full-extension slides can typically support between 75 and 100 lbs. Be sure to check the manufacturer’s weight rating for your specific drawer slides.

To prevent sagging, consider both the material and the span of the shelf. Using sturdy materials such as plywood or solid wood can provide better support than particleboard. Additionally, limiting the shelf span to 36 inches or less can reduce the risk of sagging. For longer shelves, incorporating center supports or brackets can offer additional reinforcement.

Replacing exact duplicates of existing drawer slides is usually a simple task that requires replacing the old one with new pieces in the same location and configuration. Replacing old slides with new models is also relatively easy with patience. However, changing entire cabinet layouts can get tricky and requires some know-how to complete the task. 

Fixing a drawer that is sticky, askew, or broken depends on the specific problem. Start by removing the drawer and examining the slides and tracks for any damage, bent parts, or loose hardware.

For minor issues:

• Clean and Lubricate: If the slides are just sticky, clean them and the corresponding tracks with a hot, damp cloth. Then, apply a lubricant like silicone spray or bar soap to help them glide smoothly. Also, check any roller wheels for problems.

• Tighten Screws: Tighten any loose screws on the slides and tracks. If screw holes are stripped, you may need to fill them and re-drill.

For more significant damage:

• Bent Hardware: If a slide is bent, you may be able to remove it, straighten it out, and reinstall it.

• Broken Parts: If a slide or track is broken or severely damaged, it will need to be replaced. Unscrew the damaged part and install a replacement that matches the type and size of the original.

After performing the repair, reinsert the drawer and test it to ensure it opens and closes smoothly, making any final adjustments for proper alignment. It can also be helpful to consult the manufacturer's guidelines for your specific drawer system.