every time i make it i always mess up by adding to much butter or not enough

How do i make the perfect base ?? <3

http://www.timesonline.co.uk/tol/lif...cle4654911.ece

I don't know exact quantities because I just seem to know by sight but adding a tablesp of golden syrup along with the butter takes the guess work out and makes the base very firm. If you can't get it right, at least a firm base will hold the filling even if it nearly breaks the fork to eat