수평계 만들기

http://www.cloudynights.com/ubbthreads/showflat.php/Number/5626169

http://www.wdsltd.co.uk/products/Machine-Parts/Levelling-Feet/WDS-818-Levelling-Foot-Heavy-Duty-Conical-Base-759/

http://www.red-door.co.uk/pages/productpages/nodal-ninja-accessories-and-parts.html