The SLIK SMH-250 Micro Adjustment Mount that can be used with the ECH-630 Astro Tracker. This mount allows the 630 to tilt up to 90 degrees and has 4 individual thumb screws for making minute adjustments to the position of the head. This makes fine- tuning polar alignment of the ECH-630 much easier. The SMH-250 is all-aluminum and weighs just 250g and takes up little room in a camera bag. The base of the SMH-250 is Acra-Swiss compatible so it is will easily mount into any tripod head with an Arca-Swiss compatible quick release system.