ok, as you look into the "bore" for the locking piece in the carrier, the hole at the 3 o'clock position has the longest pin inside a roll pin-it is driven flush to that face- you should see the tail of the long pin through the hole on the "right" side. the hole on the left side has a roll pin driven flush to the outside face as a tensioner to the LP. and the center hole in the bolt head in the above picture takes a roll pin to keep the roller spring wire in place. If you need pics, let me know.