I am seeming to struggle in chamber 17 everytime I straight through the glass it never works I just hit the glass and don't go through it is there something that I'm doing wrong I have followed XeiZ SC tutorial I'm sure I'm doing it correct and still nothing works can someone help please

I've tried loading Chambers from in the developers console I type load 09 and it says can't load 09 file missing can anybody help me solve this thanks

Hi all I would like to try and do speed running on portal I have the steam version of the game manage to do some of the glitches save glitch doesn't seem to work in chamber for not sure why not sure how to get on the leaderboards and would like any other helpful advice to make my speed running time better thanks