Hi Tango,
I know some tools to remove the studs. Except really large tongs or large pipe wrench there are things like these:
http://www.ebay.de/itm/Stehbolzenausdreher-Stehbolzen-Ausdreher-Bolzenausdreher-6-3-14mm-Universal-BGS-/140936736486?pt=Spezielle_Werkzeuge&hash=item20d07beee6
universal thread sizes, 15,- Euros
or these ones:
http://www.ebay.de/itm/CV-Stahl-Stehbolzen-Ausdreher-8mm-Gewindestift-Linksausdreher-Bolzen-Ausdreher-/261153956813?pt=Kfz_Handwerkzeuge&hash=item3ccdfd23cd
perfect tool, just matching M8 thread, 12,45 Euros
or this one:
http://www.ebay.de/itm/Stehbolzenausdreher-Bolzenausdreher-Schraubenausdreher-Krummerschraube-/200877126510?pt=Spezielle_Werkzeuge&hash=item2ec535b36e
universal, 25,- Euros
Have fun,
Michael
