May help:
http://on.aol.co.uk/video/how-to-replace-dyson-dc07-pre-motor-filter-118206259
http://tag.wonderhowto.com/replace-dyson-dc07-filter-catch/
For major stuff Dysion do fixed price repairs for about £80 including all parts and labour. Go to the Dyson website and look for support
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March 2015