More questions (chain tension on a fixed)

Hi Guys, another question for you...
I am now on the fixed side
how do I remove the Freewheel (although I may not remove it) its a Dicta free wheel (16tooth).
I am also curious about chain tension, how do i get the tension tight I have tried a couple of times but I just cant seem to get it tight I guess i should be asking how much tension do I need when riding fixed gear.
Are chain tugs really worth the money....
Many thanks
I am now on the fixed side

I am also curious about chain tension, how do i get the tension tight I have tried a couple of times but I just cant seem to get it tight I guess i should be asking how much tension do I need when riding fixed gear.
Are chain tugs really worth the money....
Many thanks
FCN: 5/6 Fixed Gear (quite rapid) in normal clothes and clips 
Cannondale CAAD9 / Mongoose Maurice (heavily modified)

Cannondale CAAD9 / Mongoose Maurice (heavily modified)
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http://www.parktool.com/repair/readhowto.asp?id=48
http://www.sheldonbrown.com/fixed.html
Look for the rear wheel installation section.
replacing the grips the new ones are the same length as the ones removed but the new ones do not fit they over hang by 5mm...
going to adjust the chain now while i got a chance
Cannondale CAAD9 / Mongoose Maurice (heavily modified)
will be a good chance to get to meet the blokes who run it as it will be my first ever visit. Anyone know a good LBS around Shepherds bush and Ealing?
Cannondale CAAD9 / Mongoose Maurice (heavily modified)