...
As shown in our current design, most of these constraints can be met. We are using a slide mechanism that has a manual "brake" which allows the slide to be clamped in any position. (Describe how this "brake" mechanism works. Label figure below)
We have not found a way to get both slides on the same side of the lever arm as their "open channel dosing tubes" would interfere with each other. Currently, the slides are on opposite sides which could be awkward for the operator to manipulate. One solution would be to mount the lever-arm across the diagonal of the tank. The operator would then have easier access to both sides of the lever-arm. We are considering this option.
...