Tony, my recallection of those hollow, plastic lowest-end SIS thumb shifters is their palpable flex when being shifted. My mind knew I moved them enough, but my ears and feet telling me it has't happened yet. I would have volunteered a set of NOS XC Expert thumb shifters to the purp-aluki to improve the experience, albeit in friction mode. They would be a tactile improvement as will the Paul's Thumbies.
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