what centrepin?

hi e'body, it's me again trying to buy something again!
This time I'm after a centerpin...
I was looking at that review of a Arnold Kingpin ...
I'm thinking of trying trotting for my barbel and need centerpin.
Please advise me on that...
Also what line to put on and e'thing else...
I'm new to the subject...
Please help...

Hehehehe

have a look at this:

http://www.anglersnet.co.uk/reviews/magnum01.htm