Parker Duofold Geometric Clip Missing - Challenger Replacement?

[Estragon]

I recently acquired a grey, full-sized Parker Duofold Geometric ("Toothbrush") but it's missing the clip and jewel. After some digging, I discovered a post from years ago that mentioned the rod stock for the Geometric being of the same dimension and contour as the Deluxe Challenger. Can anyone confirm whether I can simply swap a blade clip and jewel from a full-sized Deluxe Challenger onto this pen?

 

Goes without saying I'd be interested in purchasing these parts (from another Geometric - or Challenger, if it's a match) should anyone reading this happen to have some lying around.

Edited March 14, 2016 by Estragon

[Estragon]

If only to add to the knowledge base for others who might chance upon this thread, I thought I'd reply to my original post. I was able to locate a full-sized Deluxe Challenger. I discovered that the spade clips ARE perfectly interchangeable. But the threads for the jewel on the Duofold are of a larger diameter than those on the Challenger, leading me to believe that the jewels are NOT interchangeable between these pens.

 

I'm considering the judicious application of plumber's tape as a solution. Since the button-screw doesn't require much torque to secure, and the threads in the cap are metal, I'm not concerned about the sort of stress-cracks that can develop if one were to tape, say, the threads inside a celluloid or HR cap.

 

I'm not sure this Duofold is worth the trouble, really. Even after replacing the clip, it has several other flaws that prompt me to continue my search for a better example.

[Ron Z]

Don't use teflon tape. There is no such thing as a judicious application. It makes a mess, and will pull out when you use the clip.

 

Parker sometimes used a bushing/clip screw that the jewel screwed into, sometimes they used a one piece celluloid jewel with a larger thread, even on the same model.

[Estragon]

I see – thank you for the advice Ron. That's why I hesitated to rule out the possibility of interchangeable jewels definitively, having only one case from which to extrapolate. This Duofold does indeed have a metal bushing – though not of the type that can be unscrewed with a spanner (like a 51). Meanwhile, the Challenger appears to have a plastic bushing with *larger* threads. I often see these Duofolds with missing clips, but all these variations certainly make it tougher to complete one. People say Challengers are plentiful, which they are. But if you're looking for a particular clip style in a particular finish on a particular size (let alone a particular button!), the search becomes, well, more challenging.

 

Will avoid the teflon tape, then. Perhaps if both surfaces were metal it'd be a more viable solution. I suppose that stuff must be comparable to open flames and superglue when it comes to things that appear useful but are best kept away from pens. Thanks for sparing me the hard lesson!