How to open a 3 combination SAFE without combination.?

Alrighty now.. i have a sentry safe (with the key) and i have lost the combination and i have expensive things in their i need...i have done it before by gently tugging on the handle and turning the combination till it stop but i have forgot the process and the website i found out how to do it on... if u know the website plz link..if u have info(besides calling a locksmith r blowing it up r using sledge hammers on it(idiots) ) i would love you forever. Thank you(no stupid answers plz)