The LOW model can be used under tonearms with clearance between the underside of the arm wand and the mounting surface as low as 32mm and up to 49mm. The HIGH model works with ranges from 49mm to 82mm. Height is adjusted by a set screw in the base. A hex key is included to make these adjustments. Please measure the distance from mounting/plinth surface up to the underside of tonearm wand. Take the measurement when the tonearm has correct VTA and the needle is in the groove. Subtract approximately 1mm from this distance to make sure there will be safe clearance between the rubber beam and the moving tonearm. Little Fwend comes with a metal mounting plate and an adhesive tape circle to adhere the mounting plate to the turntable.