The hole in the extension for the lock screw didn't quite line up with the one on the saw head. I had to loosen up the clamp on the saw head a lot, and twist it around to get the set screw in.
Once it was on it worked perfectly and gives me the extra reach I wanted.
Price seems high for what it is, but that is NOT a ding on SLE. Their price was the best I could find. The manufacturer is the source of the seemingly higher than necessary price.
SLE was GREAT! Fast shipping, best price. I highly recommend them!