http://www.installuniversity.com/ins...r_cylinder.htm

 

The fitting that goes into the master has a restriction in it. Simply find a drill small enough to go into the fitting and push it in until it stops. That obstruction needs to be removed. After you do that the drill will go in and out easily with no obstruction.

 

I want to do the drill mod bu i am not sure exactly where to drill. please help explain where to drill out. thanks.