Hi, is there supposed to be some kind of o-ring or soft plastic/rubber skirt that sits at the bottom of the feed on a pilot custom 74? If so I think I lost mine, or at any rate it's missing. Does anyone know how I can replace it? The feed is somewhat stable but can easily be diveven off center even though the nib is firmly in the feed slot. Basically the feed is a little lose. Not terrible but bad enough. I've seen some pictures that suggest that there may be a soft plastic transparent skirt that sits at the bottom of feed. I'm not taking about the hard collar that sits inside the section. Anyway I need a replacement if it is missing. If anyone knows where I can get one or some other solution i would be most greatfull. Thanks. Albert.