ALM do not stock the cover nor bump head for the SBC33N1 , as it is a left handed thread, they only stock and supply the inner spool.
Niether do GHS or EINHELL.
I have tried to find , but alas it would seem I am now the proud owner of A completly useless Spear & Jackson SBC33N1 , along with everybody else who purchaced one last year from ARGOS , as they no longer stock them either.
Dave
June 2011
and it turns clockwise to remove
Mike
August 2010
Unscrew the bump-knob and it all slides off.
If you need a replacement contact ALM Manufacturing 01423 797208 www.almmanufacturing.com for stockists
Complete head assembly part number is SJ007
Bump-knob part number is SJ004
Richard
July 2010
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