The new screen door is installed! We are happy - it did take looking at both the enclosed instructions as well as viewing the online instructions for Jerry to feel comfortable with the job:-) We have saved the old cartridge, but not entirely sure how a "fix" might work for "down the road".
Until (or if ever) needed...the old is in storage and the new is onboard!
We are off to Wenatchee next week...and we've heard it is mosquito season there.
Jerry and Celia Fry