Hey guys, finally got a chance to mess around with the shifter today. Measured the spacing between each gear shift on each shifter. Turns out they're identicle, so installing the Seville unit is as simple as un-hooking the cable from the columb and connecting it to the Seville unit.
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I also recovered the knob last night.
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A little bracket will have to be made to hold the cable.
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Here's the old leather I pulled off this thing.