I used my current office chair chassis. Removed all the seat brackets and pushed the front and back bars right down. The next bit means making a plate up that fits across the two height bars and then bolting the old chassis to this etc. Luckily for me I had a piece of plate that was a perfect fit and had returns folded on them in order to locate the plate around the seat bars.
After sitting in it for a while this evening I definately need to do something with the seat height at the front as my feet are not touching the floor and I can feel a dead leg coming on! The old seat design was flatter whereas these come up at the front. I might be able to refit the springs and get the tilt back. It doesn't need much.
My girls love, they say it is so cool and comfy.
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