Thanks for the great plans and advice. The only problems we have run into so far in building this are that the 2" wide caster wheels in the plans do not fit all the way between the grooves of the culvert pipe, making it too hard to turn the washer, and the 3" carriage bolts connecting the culvert to the wooden barrel staves are too long to run smoothly into and out of the chain. We are trying again with 2" bolts and wheels 1" thick. Maybe culvert pipe is different than the one in the plans? Something to look at if you are building this to save some trips to town.
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Check culvert pipe size before buying casters