Join Date: Aug 2005
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Had the same problm. It is the efect of corosion in the alloy it then ends up turning the 'nut' in the plastic. The grub screw lifts the sole plate which then presses against the rails.
You need to get at the 'nut' - wedge a srewdriver or something similar to lock the nut, then try unscrewing the grub screw.
Currently in Mickdoc's garage:
2006 Renault Scenic 1.5dCi privilege