Silly question---is your pal aware that the sun-roof 'hold-down' strip is bolted down? Look at the roof (from inside the car) and at the front of the steel panel, just under that 'hold-down' strip there are a number of holes in the metal work---these are to allow access to the nuts that are on the studs attached to the 'hold-down'strip. The ends of the strip (only viewable with the sun-roof open) are either rivetted down or held down with a self-tapping screw. If you can, when you refit the strip. have riv-nuts put into the roof and hold the strip down with 'button-head' allen-bolts (aka--cap-heads).