14 Inches-22 Inches Extra Long Gas Lift Cylinder Replacement, 8" Stroke, Hydraulic Pneumatic Shock Piston, Heavy Duty 1000lbs, Universal Fit For Drafting Chairs Bar Stools, Class 4, Black

I work from home and have a tall desk so I can periodically stand while I work. This extender is perfect to raise my chair to the Goldilocks height!! The original part is very hard to remove. I had to have my son do it for me because I just couldn’t get it. So you will need someone strong to help you with this endeavor. It’s worth it. No wobbles. Works perfectly.

Works great!Just buy it, you know you need it.

I wanted to turn a really nice office chair into a counter stool for my mother. I realized that I needed to convert the wheels to stationary chair guides, and to buy a new gas cylinder that increased the max height of the chair.I actually did some measurements prior to purchasing this. Most office chairs have a maximum height of around 21-22 inches. My chair had a max height of 23.5 inches, but I still needed higher. And I later learned that I would need to account for the "plushiness" of the cushion, compared to a firmer bar stool type chair, as the cushion would sink in an inch after you were sitting in it.I was weary about how long these things last, so I tried to buy the exact size where the minimum setting was high enough to not require it to be lifted at all. So I originally bought the 8 inch lift gas cylinder. At it's minimum height, this made the chair like 27 inches high, which was too high for my needs.I ended up exchanging the 8 inch one for this 4 inch gas lift that was slightly too short, but only required a tiny bit of lift. And for the price these cost, I'm no longer worried about them not lasting for years. I can just buy another one.Installation was easy, because it was a relatively new chair. I recommend you take the wheel base off first. So place your chair probably head down, ideally on some carpet, fully exposing all wheels in the air. Then get a rubber mallet and hit against the gas lift bottom while pulling on the wheel base, and eventually the base will come off. Then get a pipe wrench or some kind of wrench with a wide enough opening, and turn it the lift cylinder to the left. Mine came off relatively easily. The whole process probably took less than 5 minutes which surprised me cuz some people say it takes like an hour of banging.My original chair piston was not broken, so I wanted to preserve it the best I could. Some say you can protect it from scratches if you put like a rag in between, but in my opinion, that's not feasible because it'll just cause the wrench to spin. I removed the old piston the best I could, but there are pipe wrench marks on it. I wanted to keep it because not only is it still good, but if I ever wanted to turn it back into a regular chair I could.Only had it about a couple of weeks, but so far so good. You're apparently suppose to go up and down on the cylinder every week or so to keep the piston lubed, but I've never done that, and most people probably don't once they find the ideal height. But that's what you're suppose to do for maintenance.I'll reiterate that I do believe this may make your chair taller than it was before on it's lowest setting, and has the range to make it much taller (drafting chair height) if desired. I've never had an issue with these before, because I always sit at the lowest setting which is around 17 inches on most chairs.

Taking the original Herman Miller Aeron gas cylinder was a pain in the rear! I tried putting on a vice grip and hammering it to the side and it wouldn't budge one bit. I then had to take a pipe wrench and a cheater pipe, got my entire weight on it the same way I do with breaking bolts/nuts on cars and it finally budged.Putting it on, there was quite a bit of play in the mechanism box so I added some electrical tape to this gas cylinder to alleviate some of the wobble. Once the wobble in the mechanism box was gone, I put the base on and tried it out. Once you set the set screw, it works great, however, there is still a bit of wobble/play in the cylinder itself. There won't be any way to actually fix it without getting a different gas cylinder but the wobble isn't as extreme as if it were in the mechanism box.Another thing to note for people that believe it won't hold over time is that the set screw needs re-adjustment over time. I over adjusted the set screw and as it sunk further into the mechanism box over time, it would automatically hit the cylinder button and activate on it's own. For those that are having an issue with it not holding, you might want to try re-adjusting the set screw again.Overall, for the price, I'm extremely happy. One other thing is that it seems to be slightly higher than the original gas cylinder but that's typical with aftermarket gas cylinders. I'd rather pay $20 for a decent gas cylinder vs $60 for the original gas cylinder (without any wobble) any day. It'll eventually wear out anyways and another one will be required.

Perfect fit! Works great!! Easy install!

It worked for my new office chair to give an extra height for my 34" height desk. :)

Why did you pick this product vs others?:Good description of product and guidance on how to select the right one for our chair

Fixed an old office chair I bought from work in an auction. Chair is probably over 15 years old. The old cylinder would no longer stay at the higher setting. The chair would sink. I put hose clamps to try to lock it in place but they broke and the upper cylinder would wobble in the lower cylinder. I bought a new base and cylinder from the mfg. but is was too short. My knees were up in the air. The chair is upholstered and a little stained which would clean up if I wanted to spend time on it. I have only had the new cylinder a day but the height and range of height adjustments are perfect. I am 6’3” and the rest of my family are short. Works for everyone.While it is not a new ergonomic chair with 20 adjustments, it is very comfortable. I am hoping to see the chair last another 10 years.