Excellent replacement part!
After installing this part I am surprised at how much smoother my chair operates.  I don’t think it was this smooth when the chair was new.  And this thing will never break!<br /><br />However,  the installation instructions — while good as far as they go — are vague at best.  The illustrations are of little value but netter than nothing I suppose.  Installing the replacement  part is not for the faint of heart.  I have 60+ years of doing mechanical work yet I had a hard time figuring out the whole process necessary to do it.  The job took about 4 hours.  Better instructions would have generated a 5-star rating!
Rating: 4 stars