I have just inherited my father's Parker 75, a sterling silver ciselé which the Parker Penography website says started being offered in 1966. It has a few battle-scars and needs a seriously good clean but appears to be in good condition, except for one thing. The pen won't insert into the cap. I looked into the cap under illumination and one or perhaps two of the arms of the inner cap (is this called the inner cap clutch?) are bent and sticking out. There are replacements advertised on ebay, and one of them is winging its way to me - but I can find no information about the best way to get the old one out, and replace it with the new one. All help gratefully received. Peter