Drilled corner of hex head on 5/8-18 aluminum plug for safety wire. Aluminum composite crush washer too big to fit recess in accessory case; obtained a copper washer. Had to drill a second safety wire hole after clocking shifted. Installed plug and safety wired to oil temp probe. Rewired probe and sealed with tape and heat shrink tubing; rewrapped split conduit. Reinstalled oil breather tube and resecured all wire runs.