l just took the needle plate off my overlocker/Seger forth first time (I've had it 3 years!). It was impressive the amount of lint it had collected. It hasn't been running great so l thought l should check, yep I should have. Hopefully it runs much better now. If you want the imputus to clean your overlocker or sewing machine here's the before and after pictures.
http://www.flickr.com/photos/73669617@N07/9030488114/