I have an office chair, which has a leaning mechanism that can be tightend and loosend as per requirement. But the problem is, whenever i lean backwards, and then come forward, the mechanism makes a krrrrr sound in the forward journey. I found out the sound comes from the cylindrical box type thing. Any ideas how can i get rid of this annoying sound? I don't see a way to open it either.
I've used Lock Ease for this exact issue.
Lock Ease is an amazing product. It's dry graphite, with an alcohol (I think) based carrier fluid packaged in an aerosol can. The carrier fluid help gets the dry graphite to penetrate then evaporates leaving no oily residue behind. It's made for lock cylinders, but I use it wherever dry lubricant (such as graphite) is needed.
Disclaimer: Amazon link for convenience only, I don't work Lock-Ease, Amazon, or the Amazon Marketplace seller distributing the product.
Get some dry silicone lubricant (whichever brand you fancy), and find a way to spray it into the spring housing.
I've used standard WD-40 to remove all kinds of office chair noise. It smells for a few hours, but then it prevents squeaks for months or years.
I've also used 3-1 oil, sometimes called light machine oil or sewing machine oil. It's a little harder to get in the right spots, but it's slightly thicker, gets more oil in (usually too much, though), and smells less.
Pretty much any lubricating oil will work, although you probably want to stay away from used motor oil. That "aroma" will stick around for days.