A well thought out product with plenty of features , with one annoying set-up problem , the unit purchased had the two aluminium legs 1.5 mm over length this may not seem a lot but it did not allow the two pre drilled holes to line up with tapped holes in base attachment point , trying to do so would strip out the threads on both sides , engineering solution : remove 2mm off the end of each extrusion provides the clearance you need to fit them with ease