We've actually found gearbox damage to be reduced with Colin's linkage kits (bear in mind they've been in use for about ten years already, before he worked out this easier to fit kit). He's designed and developed it very carefully to ensure the gate movement would not increase the stress on the selectors and synchros; the increased feel helps markedly to improve the selection precision. I don't think it's something you can appreciate until you've tried it and the wide eyed enthusiasm of the people who've fitted them so far hopefully indicates what a dramatic difference it makes.
Aggressive drivers will break MA boxes whatever linkage is used, but more feel certainly helps sympathetic drivers to use the box more judiciously. How and when you feed the clutch/power in, inflicts the most damage in my experience.
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