Grey and blue desk chair (Reisterstown, MD 21136)

This desk ( office) chair is clean. However when you sit in it, it drops down to it's lowest position and you can no longer adjust the height. I have contacted the manufacturer, and you can no longer get the part needed to fix it. I have seen DIY videos where a piece of PVC pipe is used to adjust the seat higher in a fixed position. or a child might be bale to use it at a child size desk. Free porch pick up in Reisterstown. Please respond with date and time that you want to pick up.