MASTERY MARTHeavy Duty Office Chair Base Replacement, 2500 Lbs, 28"(70 cm), Metal Desk Chair Base Replacement Parts with Universal Gas Cylinder Hole and Casters Sockets, Matte Black

I have a Flexispot C7...awesome ergonomic office chair, until, the plastic base literally split under my big and tall weight. It was rated to 300lbs, and I'm just a bit over that...but, after 8 mos, it failed. So what was I going to do? I played with getting another office chair, rated to heavier weights, but my C7 is pretty darn confortable, I sit for 8-12 hrs per day as I work from home. Then, I found THIS solution. Inexpensive, and rated to 2500...I figured I'd give it a shot. It arrived in less than a week this morning, and 10 mins of simple assembly and my C7 is now ready to roll again! What a great solution to a problem that many of these "normal sized people" office chairs present. Recommend you get the Lifelong Office Chair Wheels Replacement Rubber Chair Casters for Hardwood Floors and Carpet, Set of 5, Heavy Duty Casters for Chairs to Replace Office Chair Mats - Fits 98%...as well, for hardwood floors.

I had an office chair with a plastic star base. 1 year and 1 day after I bought it, one of the arms broke where the caster attaches. I was worried I'd have to buy a whole new chair, but looked and found this.The hardest part was getting the old star base off the gas cylinder. if you can't get the old one off, look for a video on youtube where they show you how to remove the clip and take the base off the cylinder. Once I did that, I was able to put it on the ground and whack at the base with a rubber mallet and it dropped off. I had literally hit it 50 times with WD-40 sprayed all in there and it didn't budge, but once I took it off, 2 hits on the old base and it was off.The new base went together perfectly. The five arms have two screws each to attach them to the center. This is much sturdier and a little taller than my old base, so that's nice. Totally worth the purchase!

Good quality base. Assembly is straight forward and had my chair back up and working in less than 5 minutes. Bought this to replace the factory plastic base my chair came with which was starting to crack. Turns out this is a more robust and stronger base than I had. It did add about an inch of height to my chair but not an issue since the chair is adjustable. Easy assembly, works as described and added strength.

Bought this base to add to an office chair. I believe it’s noted in the description but this base does NOT come with wheels. Not an issue I already had some. The base itself gets loose every couple of months or so and it’s not a huge deal, just need to retighten the screws. You’ll know because the chair will start rattling and then you’ll see the legs are a little wobbly. So far retightening has worked and no issues with stripping. Overall a good product.

Super easy assembly. Sturdy!

So far very good office chair Base replacement, it really is heavy duty, all metal even the center of the base where the strut goes is metal.

Very sturdy. Universal size. Reasonable price.

All metal, I had to replace a "metal" and plastic one that came with my office chair, but I swapped the caster wheels out for rollerblade style and the sockets that hole the wheel stems started to break and one broke completely, I did not realize they were all cracked until I got the old one off, but this has metal sockets and the stem of wheel fit completely inside. So much better design. It is a bit taller higher than my old one but it's workable. easy to put together. It's a good replacement if you need one.