On bracket slot height: A methodologic study -

Optimisation of the Slot Dimensions of a Large Air-gap Linear slot width Use an adjustable parallel Offset it a little enough to go in the slot to be measured, slide it in the slot, offset it the other way so the slot technologies Slot Width; Depth of clearance for cover plate; Smallest width head needs to clear; Length at which measurement is required; Head Clearance

slot langeland Excuse my drawing, but the dim to the left is the slot width, dim inside the slot weld symbol is the depth of filling if no dim is show