need help making linkage plates

freerider11

Cannon Fodder
Hi,
I have a 2002 Giant AC2 frame and i wanted to upgrade rear travel by getting new linkage plates. I know that BETD makes some but it costs too much. I have access to a metal lathe and i can transfer all the bearings but i have no idea what the design to do this would be. Its just a simple 4-bar suspension design but how do i increase travel without switching my shock...?
thank you
 
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