Yesterday I modded my Sanwa JLF with shrinkdown plastic tubing to reduce the deadzone.
Before that I did it with friction tape, as shown in the Akihabarashop-Modding-Video, but the problem was that because the broader switching-area is sloped, after aday or so the tape was drawn towads the narrow side and thus out of place.
With the shrinkdown tubing now it’s perfect, as is the thickness.
And in addition to that it is more uniform and looks much cleaner.
But see for yourself:
A definite recommendation!