Pfft, use one of those red electrical testing thingys with a fat flathead driver on the end that fits in the holes a treat, no marks

thats how my mates got f***ed, coupled with his ignorance and impatience.
i wouldnt tell ppl to do $#!t that could end up giving them problems later on.
the opening tool is best IMHO ive had mine for years and its never failed me as i have looked after it.