If you can, grind down the bradded ends flush with the gear, then try the punch, if that doesn't work you'll have to drill it out. In most cases like this the pin is either sheered or bent. Only drill to the depth of the shaft first on both sides. then try the punch again. If that does't work drill thru the remaining part in the shaft. You can always over size the hole and make a new pin. Does your repair book show a roll pin??????