Try replacing your pot with one of these from Maplins.
9.5mm (3/8€) Square 22-Turn Cermet Preset Potentiometers ......the 5k is ideal.

A bit of twiddling will be needed to set the centre OFF position.

http://www.maplin.co.uk/Search.aspx?criteria=UH24B&DOY=10m7http://www.maplin.co.uk/Search.aspx?...UH24B&DOY=10m7



(Message edited by woody on July 09, 2006)