Step 4Building it: The rear axle
Put the wheels, with shaft collars at either side onto one of the axles. Line it up so that the outer shaft collars are flush with the ends of the axle.
Now take a tape measure and measure the distance between the inner shaft collars. Cut a 2x4 piece that length.
Now, on your 2x4, measure in about 6.5" in from either end. This is where you'll put the U-bolts that hold the shaft in place. Mark the spot.
Use the bolts as a reference and making sure they're centered, mark the spots to drill.
Drill out the holes for the U bolts. Go ahead and bolt 'em in place. Now slide the shaft through the two bolts, and go ahead and put the wheels back on, wheel collars and all. When everything's lined up, take a wrench and tighten down the nuts on the U bolts well. Put some threadlocker on 'em, too. My U bolts were too short to clear my 2x4, so I kinda chiseled a hole into the 2x4 a bit to bear the nuts. I actually think this was a good thing, since it let the 2x4 rest flush with the plywood that comprised the cart body.
Sweet! You have a nice secure rear axle!
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