The reproductions don't use original mechanisms and as I understand it are relatively cobbled together. Your best bet it either to find a replacement single on eBay or have someone like Pete Serio at Precision Pontiac fix them up and calibrate them.
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Ken
'68 GTO - 464 - Ram Air II heads - 236/242 roller - 9.5” TSP converter - Moser 3.55 Truetrac ( build thread | walk around)
'74 Ventura 350
'69 AMC Javelin SST
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