Helped needed to reaaembly top and bottom sections of AT44

Hi, I have a Hatsan AT44 that I am trying to reassemble.

Sort I cant seem to upload photo, but I will do my best to describe the part. On the lower section with the barrel and plate with Hatsan written on it, between this plate and the round bolt? That pulls the hammer back there is a rectangular block/plate sticking up maybe 1/4" what is this for and does the hammer need to be in a certain position in relation to this when the 2 sections are joined? And can anyone describe the hammer or cocking lever positions when reassembling the 1st and the 2 sections?

Thanks Ian.