check that the screw is deffo missing, cos it is a right paint to get an allen key onto, so in fact it might be there but you can't find it. you can't see it, you can feel when the allen key fits in though. that will stop your ASA moving back and forward.
also on another note, there is another hole you can fit this 'screw' piece in if you want the bottom line/asa piece to stay firmly in place.
hope that helps. the allen key you need btw is 3/32"
also on another note, there is another hole you can fit this 'screw' piece in if you want the bottom line/asa piece to stay firmly in place.
hope that helps. the allen key you need btw is 3/32"