Just did it. It took two of us, but only a couple of minutes and no tools (except a table knife) once we'd worked out what the problem was. The reason the strap doesn't thread easily through the slot is that there is a sprung two-part mechanism that needs to be held open. One person threads the strap through while the other keeps the mechanism open.
Person 1:
1) Find the slot under the chair that the strap goes into - turn the seat upside down; it's a thin gap you can feel with your fingertip when you run your finger along the narrow back of the metal strip under the front of the seat (not the base).
2) Remove the metal rod that attaches the grey reclining lever. The rod is about 20 cm long and can be pushed out without tools. Removing this rod seems to make it easier to open the buckle mechanism. When replacing the rod later, you just have to line it up carefully with holes (we used a torch to help us see them)
3) Make sure the strap passes under the metal rod at the bottom of the seat back (you can see how here in a small photo here: http://www.englishforum.ch/attachments/sale-wanted/37565d1327058634-sale-maxi-cosi-tobi-car-seat-9mths-3-yrs-zh-maxi_cosi_tobu_small.jpg)
Person 2
4) Push back buckle as far as it will go (it goes back past vertical easily, then needs another firmer push,
5) Hold the buckle in this backwards position.
6) Insert a table knife (rounded and blunt, not sharp) into the space under the buckle and push back the sprung, hinged plastic part that the knife touches at the back.
7) Person 1 then threads the strap back through the slot, pushing until then end comes out.
8) Tie a knot in the end of the strap so you don't accidentally pull it through again!
9) Replace the metal rod in the reclining mechanism.
10) Done!
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