Haven;t see that particular one, but have the little shorty ones on 2 out of 3 sluices, and have seen a couple of other folks with them as well.  Known tip, but not everyone has seen it or thought of it, thanks for posting up a pic and putting it out there for others.  Gives a fast setup when settig up.

After the first year of going out and doing it, like many other things we do daily, you wont even look at it.

Many factors figure into setting a box,
Water flow, angle of box all change depending on these factors.

You will get a 'feel' for set up over time.
Run a couple buckets of over burden, watch the riffles and the material behind them, that will determine any adjustments.

Its interesting to me what a small 1/4" adjustment will do for the box.
And its hard to find that perfect rock to slide under the box.


Bill

Great Iidea

I might try this on my multi sluice with 2 of them, 1 for 11 degrees and the othe for 13 degrees. But for the A52 I use a tried and true for me. Drop a 1 inch rock in at top, if tow ash down and out,then put a 3 inches and see if it sticks. Water flow good , feed it. I am most certainly losing gold, but if I can do double the buckets at 85% recovery, then it is more gold than half at 95%.