its like this…
picture you have a nail in your car tire…you notice it, and your tire is still holding air…now when you take the nail out, your tire goes flat
same principle with quad tires. As long as they go all the way through (are 5/8 or longer) the tire lining is hard enough to make a perfect seal around the screw that goes through to where it wont leak.
who told you that? on a dirtbike you dont go all the way through because dirtbikes have tubes…on a quad, you go all the way through and it doeswnt affect them.