Sometimes there might be a small burr on the end of the e tube, or on the little port it is to fit through.
Se if you can get a little dental hook or otherwise small tool to poke it out. Wood or plastic is best as not to scratch or damage further.
Had some running around to do. No pics necessary... thank you guys for your time and input. It just needed a little extra love... I was being a little cautious as to the brass looking fittings.