Evaluate and Slice the header rail. Pull the shower door closed and prolong your tape evaluate from one aspect to the opposite. Mark the dimensions over the body header and use your hacksaw to chop it to sizing. Sleek down the raw edge using a metal file.[13] X Research source https://www.deluxeshowerdoors.com/services/glass-shower-door-installation-in-needham-ma-deluxe-shower-doors/