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Bolt-Down Trailer Lock
There are a number of different products on the market to lock up trailer hitches but British inventor James Sheldrick took a different approach.
  He wanted something that would be anchored to the ground and that could be driven over. His solution was a chunk of steel plate bolted to a cement slab and fitted with a short pto shaft and U-joint with a ball hitch welded to the end. The ball is simply inserted into the trailer hitch and locked down. To steal the trailer, a thief would have to cut off the hitch and install a new one.
  Contact: FARM SHOW Followup, James Sheldrick, Home Farm, Shipbourne, Tonbridge, Kent, United Kingdom.

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2003 - Volume #27, Issue #1