beyerdynamic-dt-911-headphones

My first post here.I want to know about these headphones.I've always thought that's just an old and crappy piece of vintage, but- http://www.ebay.de/itm/Beyerdynamic-DT-911-Kopfhorer-/160710432569?pt=Kopfh%C3%B6rer&hash=item256b169739&autorefresh=true#ht_680wt_1165...

Hi,   I hope some long standing Beyerdynamic-fan reads this. My old DT-911 needs new headband pushers and the headband itself. The problem is, i dont know how to remove the plastic clamps of the driver hangings. If thats done i guess you just can slide the rest of the parts out or in.    ...