hey guys i just got all the steel for my front bumper so now im ready to start building it. the one thing im confused about though is using my chopsaw to notch the pipe. the only info i found was this link on pirate.http://www.pirate4x4.com/articles/tech/billavista/Links. how do i know what degree to make the notch at on both sides? ill be using 1 1/2 pipe if that matters.