Thanks for the quick response. What you are saying seems like it would work but the manuel says to "squeeze the retainer ring" with pliars which I beleive you are calling the cap, and the retainer should then lift up from the pressure of the spring. Prying the retainer like you suggested would appear to do the job but I do not want to bend or damage it. Squeezing the retainer with pliars will also seem to cause damage.