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Re: pic: Sheetmetal 6WD
Instead of zip ties or springs, we have used screws to tension dchains like this:
Our axle blocks were made out of 1" wide 1/4" thick aluminum plate, cut to length. We had a hole for the axle (3/8") and a hole for a securing bolt. In the frame, we had two slotted holes, one for the axle bolt and one for the securing bolt. We then made the axle block longer then needed to hold the axle, and drilled/taped a hole down the long end for a 10-24 bolt. When you tighten the bolt, the axle slides and the chain is tight. You could then tighten the securing and axle bolts to make everything nice and tight.
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