Richard, thank you for advice, unfortunately, I am far from B&Q shops.
I managed to make this: took fishing-line (dia. about 1 mm) and wound it in spool.
timur
May 2009
Go to B&Q and buy a BD720 spool and line (barcode 3470787) and just clip it on.
Or call ALM Manufacturing 01423 797208 for stockists
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix grass trimmers.