I bought the one from sears for the quick change bits and to see if the chuck was the same since I have one that is broke. Took the old chuch off my machine and yes, they look alike, they are not. The one for the CarveWright has threads in the head and the one from sears has a split slip coupler to slide on the shaft of your router. Almost the same but not. Oh well, guess my router gets an upgrade....lol Still, I have the extra adaptors so now my bits can do double duty.
If it wasn't for bad luck, I wouldn't have any luck at all.