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Originally Posted by apalrd
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So THAT'S what that tool is used for! I saw something like that in our cart for years, but never had a clue what it was.
Our solution to working with chains in tight places was a set of small fingers (mine) and adjustable chain tensioners. I don't know why the design worked the way it did, so I'll try and dig up some pictures, but all you had to do was loosen or tighten a bolt at the end of the drive train (we used extruded aluminum, and the ends were left open) and it would move the axle/sprockets to pull the chain tight. The chain was initially seamed outside of the chassis and then put in at the same time as the sprockets and axles, but if it needed to be removed at competition for whatever reason, loosening the chains helped to make the masterlink more accessible - if the axles were close enough together, we could pull the linked section up through the top of the chassis and take off/put on the link with plenty of space.
I don't know how this would work for 4WD (shown in your picture) as opposed to 6WD (what we used), but I'm sure that something similar could be designed to suit your needs.