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The installation and adjustment instructions are missing from the box. I contacted David Certano (the designer of the unit whose name appears on the box and on the unit itself), explained the issue and asked for a copy of the instruction/installation document. He replied "Contact AllParts." So much for his website message that welcomes communication on the products that he designs. I know that there are installation/adjustment videos online. I want the actual document to keep in my luthier tookbox and I am awaiting a reply from AllParts. I have plans for installing benders on my lapsteel guitar projects and I will not be giving Certano my business again. I will purchase my benders from Peters Instruments instead. The mechanisms operate the same way and are less expensive. As for this particular unit, it is made well and it does what it is advertised to do. Think of it as a Bigsby for two strings of your guitar.