quote"When pushing a fish tape into a live panel I screw a rigid coupling onto the connector of the pipe entering the panel, then add a flex connector and a 3 foot length of alum. flex"

Now I bet you don't want to hear a lecture from me about fishing in live panels so I won't do it, but at least change out using aluminum flex to using smurf tube if you are going to do it since smurf tube is non conductive.