A set of real hooks might help...they're much stiffer.

http://cgi.ebay.com/ebaymotors/Mercedes-Dashboard-Instrument-Cluster-Pull-Hooks-New_W0QQcmdZViewItemQQcategoryZ43996QQitemZ4584421174QQrdZ1QQsspagenameZWDVW

Here is a page that is written for S class vehicles, but it might give you some help.

http://v12uberalles.com/instrument_cluster_removal.htm

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