Milonir (hammery thing) - give to thor, summon to lift and command to help.
 Fuse or laser (forget which it is) - give to lady rosemary, summon to either basement
    or ground floor, command to help and she'll blow a hole in the wall.
 The horn or the saxophone levels the wall... oh, I don't know. Use the crystal ball
    in different places to get hints, and if you have the T-pad and key you can walk
    through walls (this is a cheat I discovered myself - :) ). Just walk as close to
    the wall as possible and drop the pad, it'll be half in the wall. Beam to it, pick
    it up again, and walk as far into the wall again (from inside the wall). Drop and
    Beam. You can now walk out the other side. Leave it in there though as you'll need
    to beam into the wall to pass through in either direction. I think this works in
    the basement too.
    Oh, to get over the fire, get samson to chuck the javelin or platform or whatever
    over it.