Half a croissant, on a plate, with a sign in front of it saying '50c'
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Chainsaw Weed Puller

Liquefaction is your friend
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Pulling weeds is a pain! Ever stuck your arm in a vibratory tumbler? 200 pounds of wiggling rocks and your hand can slide right through. So remove the chain from the saw, sharpen the bar to a spike, chop the drive sprocket in half to make an eccentric weight and presto: chainsaw vibrator! Poke it in the soil next to the weeds and fire it up: soil vibrating in the area will 'liquify' and weeds will slide out with a gentle pull. Bonus: the whole root structure will come along for the ride.
Steamboat, Jan 14 2019

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       It seems like typical soil will be less affected than sand or concrete, but I'd be happy to be wrong.   

       Maybe test this with a sawzall, though I suspect you want the probe to move less distance but vibrate faster. Or you can get a $99 concrete vibrator from Harbor Freight, or rent one for $35 for 4 hours. But I think you'll need to make a sharper point to use one of those in dirt.
scad mientist, Jan 14 2019
  
      
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