
Hi,
Have a look at http://dogtraining.co.uk/moreinfo.html#check chain (sorry, can't make link work today

. One of those things that's impossible to explain in words!! Hope it helps.
Just for interest, is it for show or general use. If for general use, have you tried a half check before resorting to a check chain? Half check is like a leather collar that doesn't fit all round the neck, with a chain insert that briefly tightens the collar - kinder to the dog and much easier to use.
M.