Yes, I've been trying to source this spring part number 54129634112 with no success.
So I've decided to make my own. Credits to Harold for telling me that he also made his own and it's been working great.
I visited the local store and the only thing that matched the mechanical description was a zinc plated "R" clip in 3/16".
Using a picture I had of a genuine W Spring, I used two pliers and bent the R to W spring. It might not be a perfect W, but it's W enough! Just remember, the key is to use a good quality R clip.
It works perfectly as it should.
Another step closer! [emoji482]