Are you on a computer , or on a cell phone ? On a computer , click on Resources on the header . It will open up a page with everything from a file with the Library Index , to a range of charts on bushings/tube lengths by supplier or one with all pen types . A click on any of them gives access to a jpg file , which should open with another click .
Using a cell always makes things more complicated . Click on the 3 bars to the left of the Logo . Scroll down to Resources . Click on it and you get the Library Index . The arrow to the right keeps taking you deeper into the contents , starting with a whole bunch of files on tube length / bushings . A click on any one allows you to download the file or view directly by clicking on the jpg .
More or less , that should get you where you want to go .