Easier way to get tesla cannon prototype

Once you get high enough using the save glitch jump (if you dont know click the link below) instead going up further go high enough until you can jump on the ledge and then jump on the metal then jump on the rock..... The video is better than my decsription just watch it . The link: http://www.youtube.com/watch?v=-uzPJidGhOU Overpassed the tesla canno prototype in the video by mistake..... =(