I own a Rockwell (pre Porter Cable) 630 router, which needed a bottom bearing. This isn't he more common 6202 bearing, but one with an extended center. Looking at a well know vendor's web site bearing is $42 + shipping. Looking on Ebay same bearing was less than $18 delivered. Ordered one on Tuesday, and it arrived today. Already installed it. 50 year old router now purrs like a kitten