Can you expand further? I'm not a native english speaker and couldn't find what a spacer is. I would like to do the same you did since I removed the spring from my R button, without doing anything to the L button, but want them to be at the same height and not just have the R button depressed all the time.
I just used "spacer" as a generic term for something I made myself that made the R button the same height as the L.
I can try to explain what I did -- it isn't that complicated in reality but might be hard to describe.
I took a knockoff controller, non-Nintendo brand, that I wasn't really using and took out the L and R buttons. I cut away at the "shell" of the button until all that was left was the rod in the middle:
Then I cut that rod up into 1/4 inch sections (about 5.5mm) each.
So now all you have to do is put this little rod inside the black thing (or whatever color yours might be is) :
Then put in the R or L button, then carefully put it back in the controller. This can be hard because if you squeeze the trigger button too hard it will all pop out.
And that's all there is to it! The hardest part certainly is cutting the rod into small chunks of the right size. I heated up a knife so it melted the plastic as I cut.