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Sedge's tip is really for the "I have no other option" type of a situation. One should never use it if accuracy is required AND/OR better ways to align the rails are available.The best way to join the rails /unless using a self-aligning connectors/ is to use a reference straight edge.The self-aligning connectors are the second best as they depend on the accuracy of the rail ends way more than a straight edge does.Having a third small rail - like 800 - and a couple clamps is ideal for this in practice as no "waste" hardware is needed then.