Barn door tracker

• Orignal article
• Metric version with M6, 1 thread/mm. 25.4 TPI. Ratio between M6 and 1/4"-20-UNC is 1.27. So 290mm/1.27=228.34 mm from hinge (with same rotation rate as in article)
• Straw along hinge for polar alignment
• Set tee nuts with bolts and nuts

• Manfrotto 190 XPROB
• Manfrotto 804RC2
• Manfrotto 496RC2

• M6 bolts (easy to get)
• M6 dome nuts (easy to get)
• M6 tee nuts (clas ohlson)

• 1/4"-20-UNC threaded bolt (gwr-fasteners)
• 1/4"-20-UNC nuts (gwr-fasteners)
• 1/4"-20-UNC tee nuts (ebay!)
• 3/8"-16-UNC female to 1/4"-20-UNC female converters (Amazon)
• 3/8"-16-UNC male to 1/4"-20-UNC male converters (Amazon)

-- StewartBoogert - 24 Aug 2013