While waiting for my couplers and .050 hex tool to arrive for my x-squared, I would like to gather tips here to include trimming of the rubber itself. Did you have to cut or shave down the rubber in order to make it fit? Blade, file, crazy glue, etc? Ever use WD-40 to make it slip in easier? This is a first for me and don't want to ruin anything. I had Mark service my Juliet and it had a distinct scent around the nose bridge, making me thing that WD-40 was used. I'm not sure though? I purchased these newly designed couplers ( oxm-parts ) from a member here. Hopefully, they are as stiff as Mark's... Thanks in advance for your assistance.