Can anyone advise me how to change the ear tips on the Ultimate Buds? I got my UB5s this afternoon and the stock medium tips are a bit large for me. The process should be rather straight forward but the silicon or rubber material seems rather fragile on the small tips. When I go to put the tip on, the material on the inside of the tip slides inside out. I've noticed with the medium and large sized tips the material seems to be a bit thicker and holds it shapes when put onto the end piece. Any thoughts?