Mine has that modification - it was in the car when I bought her.
May be that when adjusted properly it takes any play out of the cable and mechanism, meaning that the handbrake action starts sooner?
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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