|Use washers under the cover bolts and torque them with care. The idler pulley bracket mounts in four of these holes. The red “pop-off” button on the top of the front cover is used to relieve pressure from the seals and to check them. The newer type seals on the market usually don't have problems, but the button is kind of cool and nostalgic. We will also use this hole to put the 80-90 synthetic gear lube in (half way full, about 1 quart).