play in the headset

i bought a 2nd hand bike, which when i bought, the headset had to be done up unbeleiveably tight to stop the play and made the steering really tight. so i overhauled it and bought new bearings for it etc which sorted it out as treat. ive jsut bought a new stem which has a smaller stack so i bought another spacer for it, but it has silly amounts of play in it and no matter how tight i do it up, it wont go. any ideas? do i need a new headset?
Trek Remedy 7 2009
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Boardman Pro Singlespeed - Sold
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Giant Defy 5 2012
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Boardman Pro Singlespeed - Sold
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Giant Defy 5 2012
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VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/
viewtopic.php?t=12634629
Boardman Pro Singlespeed - Sold
viewtopic.php?t=12752297&highlight=
Giant Defy 5 2012
VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/
viewtopic.php?t=12634629
Boardman Pro Singlespeed - Sold
viewtopic.php?t=12752297&highlight=
Giant Defy 5 2012
VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/