I'll answer this question any way even though charles as found the answer.
What I did was use a small flat headed screw driver and bend the end so it looked like the 'Switch Removal Tool' advertised on www.scrubvac.co.uk.
All I did was slide the screwdriver down the inside of the switch (where the small hole is) then put slight pressure to disengage the small lug on the bottom of the switch cover at the same time lift the screwdriver and switch cover off.
When the cover is off you will see a star headed screw, take that out and lift the switch assemble out.
Good Luck!!
Eric
May 2005