The invention relates to a method of producing a stable substantially aqueous silanized colloidal silica dispersion having a silica content of at least about 20 wt %, comprising mixing at least one silane compound and colloidal silica particles, wherein the weight ratio of silane to silica is from about 0. The control apparatus enters a small turbo operating state in which a small turbocharger is mainly operative, during relatively low-rotation-speed and low-load side, and enters a large turbo operating state in which a large turbocharger is mainly operative, in a relatively high-rotation-speed and high-load. The second switching element is electrically connected to a second data line adjacent to the first data line. Specialists at an item pick station select orders from the bin and retrieve items to be assembled into a basket from inventory, as well as the basket vessel itself. In the safety mechanism, a movable hook or arm selectively prevents the striker, and linked components thereto, from completing an operational cycle. A method of adjusting a wood processing head is also disclosed.