Photo 1: Does your chair sag or sink down ? Just attach a 4 or 5mm thick toilet paper core As shown. Once attached, your chair cannot be adjusted But u will sit tall. Never sink down again. Photo 2 : Remove small metal clip at the bottom of vertical shaft as shown. Photo 3: Or u can buy a gas cylinder like this. And watch YouTube how to fix it. PS. I'm ok with the toilet roll core although Some youtube videos show a cut plastic pipe affixed to prevent sagging But I'm thinking there may be tiny plastic flakes on the floor over time as I swivel the chair. Photo 4 : U can also save your laptop bags, wallets, Luggage bags. ..anything with zippers If your zipper is stuck. Do browse that how to repair zipper listing for more photos and details. If u found my 2 listings useful, Can exchange likes with me?