Using a Power Jet or a Turbo Jet are the best way to convert a Super Sleuth into a Dredge, a power jet (see image) will give you the strongest vacuum.
Either way all you need to do is, fit a discharge hose or the power jet directly into the back of the Header box and you are well on your way, you may need a spray mat or cover to stop splash back of the soil and water.
We make a DREDGE CONVERSION KITS for our Super Sluice. [BackPack conversion]
Here are some important tips you need to learn, how to operate a dredge properly.
See the "Portable Back-Pack Super Sleuth" it's the smallest in our range.