Chainsaw Repair

While playing cat and mouse with a field groundhog that has busted me twice.
Checked on red one. No rod going to the black button. Guessing being AV model the front area in front of button is all open to see I guess. Not like the other 3 regulars I have had. So I could take a screwdriver and push the black button up. Just hollow button with no rod. No word OIL under the button like the other 3 with rods.