Hi. The bevel is the recess for the hinge knuckle. An Xacto knife works, but the fastest and most consistent method is by using a rotary cutter like those from ROBART.
JCINTEXAS:No, didn't fly the 104-wanted to. During my time, this was the hot ticket (and still is, NOTHING is faster than the 104 to 100,000+ ft. NOTHING.). The Air Force had other plans for me and I wound up in Bombers , then Transports. Had a lot of fun, too.