Good Service Vac

I have a Good Service vac fill pen and want to know whether the Parker diaphragms will fit and if there should be a spring on the plunger. As there is a short blind cap I assume the plunger would have it underneath so that you pull it out and the spring returns it, but who knows better? The plunger mechanism is all in plastic.

Unable to get any of my photos small enough to upload.

to answer the photo question, not the pen question

I use Fast Stone Photo Resizer.  Free. Works well.

http://www.faststone...sizerDetail.htm