I think she's the niece of the inventor, Nick Franklin. She's apparently got a garage full of spares. They're not cheap, but they are the original item.
The website is Aries - Providing Vane Gear Spares. If you go to "Products" there is a link to "Rebuild Tips". It's not difficult to rebuild one yourself if you've got basic tools and a modicum of mechanical sense. From the "Products" page, surf around a bit until you find "How they work" -- there's an exploded parts diagram that will help you with the rebuild.
It sounds like you may have only to slightly readjust the gears. To do that you will need to take it apart, and once it's apart you might as well replace the parts that have worn. Helen sells a "rebuild kit" that has all of the parts that normally wear out.