i used the paper trick to centre spot my primary. it works well.. cause the folds in the paper kinda make it want to hold a conical sort of shape so really the only part of the paper that really touches the mirror is the centre of it.
there's a good collimation tutorial that's made in flash.. i've got the link at home.. if your a more visual type of person like me it's excellent.. i'll post the link once i get home.
el
