When you are building your own Eldorado, you just cut the profiles to the width that you want your sluice to be. (If you want to build a sluice that is 30 cm wide you buy pre-cut 30 cm profiles, see Art. 140) Then you put the pieces together, in much the same way as putting together rake-up boards. The profile's joints fit each other perfectly.
Then screw on a pair of side pieces - for example, strips of sheet metal, plastic, boards or plywood form. The bottom profiles have pre-drilled holes for 2.8 to 2.9 mm screws.
(We also have undrilled 1 m side peices in the same material, see Art. 144).
You can also use Eldorado profiles as inlays in U-shaped aluminum sluices. This way you can build a sluice in any width and any length.
Each profile has different styles of traps. This is to catch all gold, from nuggets to micro. The depth of each trap is about 15 mm, and the "micro-traps" are just a few mm deep. The traps are also made so that they can tolerate very large variations in water flow through the sluice. An Eldorado Special, 1 m long, has 100 traps!
You'll probably want a leaner, more "normal" sluice width. Then the preferred width should be 50, 33, 25, or 20 cm pieces. The long profiles are 100 cm x 10 cm. Profile surface is 10 dm2.
If you want to build a narrower sluice - for example 20 cm wide and 1 m long, you will need 20 dm2 of profile, that is 2 long profiles. That makes it a cheap sluice!
You should be good at cutting straight, and you have to screw it together yourself.