Eye sizing

Hi all.

I am in the process of replacing my rigging, and was interested fo find this nugget of wisdom from Brion Toss in his 'pieces of string' series:

http://www.briontoss.com/education/a.../miscoct98.htm

Clearly a small deviation in pin size to hole size can cause some serious woes. What this article doesn't touch on is the appropriate sizing of the terminal hanging on the pin. For example, If we have a toggle at the mast head with pin diammeter of 10mm (and therefore pin of ~9.9mm to avoid point loading), would the eye that it held also have to be ~10mm, or does it matter less?

Any insights welcome; I'm stumped - and a beginner:-)

Thanks for any info
Adam Tait