More changes to the system, yet to be tested out. I moved the chain anchor above the top rail and added guides for the chain. I didn’t have any washers so I used nickles to keep the chains from slipping off the guides. I also recessed the bolts for the top bar to eliminate them interfering with the chain movement.
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Those look like some good modifications. I like how you used nickels. I’ve done similar in the past. Don’t have a washer?, Just drill a coin out. 
Tks for posting your mods.
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I like the use of white paint (or whatever it is) to mark the zero link on your chain. I learned Friday how hard it is to find the link with the Sharpie mark on it when looking at a bundle of chain!
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I think I used White-Out, It makes set up so much faster. now when I need to adjust the calibration I can go to exactly the right spot.
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